Senare Minority Leader Chuck Schumer (D-NY) on Tuesday night said that if Donald Trump does not select a “mainstream” Supreme Court nominee, Democrats in the Senate will do their best to keep the seat open.

“We are not going to settle on a Supreme Court nominee. If they don’t appoint someone who’s really good, we’re gonna oppose him tooth and nail,” Schumer told MSNBC’s Rachel Maddow. “They won’t have 60 votes to put in an out-of-the-mainstream nominee and then they’ll have to make a choice: change the rules. It’s gonna be very hard for them to change the rules because there are a handful of Republicans who believe in the institution of the Senate.”

“We are not going to make it easy for them to pick a Supreme Court justice,” he added.

Schumer said that it is “hard for me to imagine a nominee that Donald Trump would choose that would get Republican support that we could support.”

Maddow then asked if Schumer would do his “best to hold the seat open.”

“Absolutely,” Schumer replied.

Watch part of the interview via MSNBC: