Counselor to the President Kellyanne Conway said Monday that Democratic senators who have vowed to filibuster President Donald Trump's Supreme Court nominee are in the business of "permanent protest."

"They don’t even know the person’s name yet," Conway told Fox News' Martha MacCallum on "The First 100 Days." "They haven’t even met him or her and they’ve already committed themselves to obstructing, blocking and filibustering that person."

Trump is expected to announce his choice to replace the late Justice Antonin Scalia Tuesday evening. The seat has been vacant since Scalia's death this past February. Former President Barack Obama nominated federal judge Merrick Garland for the Court, but Senate Republicans prevented his nomination from being heard.

Conway declined to say whether she supported Senate Majority Leader Mitch McConnell, R-Ky., using the so-called "nuclear option" to change filibuster rules and force Trump's nominee through the Senate with a simple 51-vote majority.

"We should take a look at all of our options and I think [former Democratic Senate Majority Leader] Harry Reid probably regrets the day that he went so nuclear with the nuclear option because now his party is no longer in power," Conway said. "That’s up to Leader McConnell and his colleagues. I’m supportive of a fair and full process."

Conway also fired back at Obama's criticism of Trump's controversial executive order suspending refugee processing and immigration from certain countries.

"He’s welcome to say what he wants. It’s a free country, including for ex-Presidents," Conway said. "[But] this is temporary, it is 90 days and it is very narrowly restricted to seven countries that none other than President Obama’s administration identified as high risk for harboring, training, and exporting terrorists.