Appearing on "Fox & Friends" with hosts Steve Doocy, Ainsley Earhardt, and Brian Kilmeade, Lahren said that Republicans are "sick and tired of seeing this president -- who is getting results for actual American people -- be attacked and harassed and hunted like this."
Nadler invited the president to participate in his committee's first impeachment hearing on Wednesday. The president has declined the offer, noting that Democrats were well aware of the timing.
On Monday, House Republicans delivered a point-by-point rebuttal to the efforts, claiming in their own 123-page report that evidence collected in the inquiry to date does not support the accusations leveled against the president -- nor constitute grounds for removal from office.
House Intelligence Committee Chairman Adam Schiff, D-Calif., responded, accusing Republicans of trying to placate the president.
"I think that some people during the first investigation wanted to give it a little time. But, when it's been investigation after investigation and we have nothing, no collusion, no obstruction, no quid pro quo, the American people are frustrated and they're going to galvanize behind their president," Lahren said.
The Fox News contributor told the "Friends" hosts that she believes that the "average American is very tired of the impeachment hearings."
"They want to hear about the issues that impact them. And outside of the Beltway and outside of the mainstream media, these things don't necessarily impact the everyday American," Lahren said.
Lahren's warning for the president ahead of the 2020 election? Stick to the issues.
"What impacts them is jobs, the economy and immigration, which is why I also caution President Trump -- I think he's got a lot of support right now -- but don't forget what got you elected in 2016," she said. "That was the promise to build the wall and crack down on immigration."
Fox News' Brooke Singman contributed to this report.