The Clinton campaign has met rival Sen. Bernie Sanders’ challenge to debate him in New York ahead on the state’s April 19 primary, but the final negotiations have resulted in the kind of acrimony the has pervaded their primary contest in recent days.

The Clinton campaign said Saturday that the Sanders team rejected three days offered this week: Monday night, the evening of April 14 or on ABC’s April 15 “Good Morning America” show.

“The Sanders campaign needs to stop using the New York primary as a playground for political games and negative attacks against Hillary Clinton,” said Clinton National Press Secretary Brian Fallon.

He said the Monday date was apparently rejected because the Sanders campaign wanted the debate after Tuesday’s Milwaukee primary and that the April 14 and 15 offers still stand.

Clinton has a huge delegate lead over Sanders in the race to win the Democratic nomination in July. However, Sanders is on roll, having recently upset Clinton in the Michigan primary and taken five of the last six state contests. And polls show he’s in a tight race with Clinton in Wisconsin.

A loss in delegate-rich Wisconsin or New York would be a major setback for Clinton, particularly in New York, her adopted home state for which she was a U.S. senator. Sanders was born in Brooklyn.

“We are very pleased that Secretary Clinton finally has accepted our request for a debate,” Sanders spokesman Michael Briggs said in response to the offers. “Unfortunately, the dates and venues she has proposed don’t make a whole lot of sense.”

Briggs the Monday night idea is “ludicrous,” considering the NCAA men’s basketball finals are being played at that time and Syracuse could be one of the teams. 

He left open the possibility of compromise by saying, “We hope we can reach agreement in the near future.”

However, the episode capped an especially scrappy week for the campaigns.

Clinton snapped at a Greenpeace protester. She linked Sanders and Tea party Republicans. And she bristled with anger when nearly two dozen Sanders supporters marched out of an event near her home outside New York City, shouting "if she wins, we lose."

"They don't want to listen to anyone else," she shot back. "We actually have to do something. Not just complain about what is happening."

After a year of campaigning, months of debates and 35 primary elections, Sanders is finally getting under Clinton's skin in the Democratic presidential race.

Clinton has spent weeks largely ignoring Sanders and trying to focus on Republican front-runner Donald Trump. Now, after several primary losses and with a tough fight in New York on the horizon, Clinton is showing flashes of frustration with the Vermont senator — irritation that could undermine her efforts to unite the party around her candidacy.

According to Democrats close to Hillary and former President Bill Clinton, both are frustrated by Sanders' ability to cast himself as above politics-as-usual even while firing off what they consider to be misleading attacks. The Clintons are even more annoyed that Sanders' approach seems to be rallying — and keeping — young voters by his side.

While Hillary Clinton's team contends her lock on the nomination as "nearly insurmountable," the campaign frequently grumbles that Sanders hasn't faced the same level of scrutiny as the former secretary of state, New York senator and first lady. Her aides complain about Sanders' rhetoric, claiming he's broken his pledge to avoid character attacks by going after her paid speeches and ties to Wall Street, and they point to scenes of Sanders supporters booing Clinton's name at his rallies.

Actress Rosario Dawson's 15-minute speech at a New York City rally on Thursday, in which she rallied the crowd by crying "shame on you, Hillary" and noted that Clinton could soon face an FBI interview over the email controversy while at the State Department, underscored the growing tensions between the campaigns.

Clinton hopes that big victories in New York and five Northeastern states a week later will allow her to wrap up the nomination by the end of the month.

But aides acknowledge that Sanders, who's raised $109 million this year and has pledged to take his campaign to the party convention in July, is unlikely to feel significant political or financial pressure to drop out of the race, even if it becomes clear he cannot win the nomination.

Clinton stayed in the 2008 contest against Barack Obama until the bitter end, though her initial advantage with superdelegates, who later flipped to the Illinois senator, gave her a stronger case for the nomination.

Unlike eight years ago, when California Sen. Dianne Feinstein brought Clinton and Obama together for a meeting, few Democrats are in position to broker peace between Clinton and Sanders. For most of his political career, Sanders identified as an independent — not a Democrat — leaving him with far weaker ties to party powerbrokers.

According to an Associated Press analysis, Sanders must win 67 percent of the remaining delegates and uncommitted superdelegates — party leaders and officials who can support any candidate — through June to be able to clinch the Democratic nomination. So far he's only winning 37 percent.

Joel Benenson, Clinton's chief strategist, said: "We're going to get to a point at the end of April where there just isn't enough real estate for him to overcome the lead that we've built."

Still, any kind of truce is probably weeks, if not months, away.

For now, Sanders is costing Clinton significant time, money and political capital. His victories in recent Western caucuses underscored her weaknesses among younger and white working-class voters, important elements of the Democratic coalition. He's favored in the Wisconsin primary Tuesday.

Sanders is drawing sizable crowds in New York, attracting 18,500 to rally in the South Bronx on Thursday. A victory in that state, which Clinton represented for two terms in the Senate, would deal a significant psychological blow to her campaign, rattling Democrats already worried about her high national disapproval ratings.

Clinton is more reliant on traditional fundraising than is Sanders, who's raised the bulk of his money online. Even as she prepares for New York's primary, she has scheduled fundraisers before then in Denver, Virginia, Miami and Los Angeles — at the home of actor George Clooney.

She needs to continue raising primary dollars because June contests in California and New Jersey will be expensive. Sanders faces fewer financial anxieties.

Sanders adviser Tad Devine said the senator was not encouraging his supporters to disrupt Clinton's events and was focused on his own message. But he also said the campaign would respond when Clinton mischaracterizes Sanders' records and positions.

Her attacks, he said, only help Sanders.

"When your attacks against your opponent feed the biggest weakness that you have, you are undermining yourself," said Devine.

The Associated Press contributed to this report.