WASHINGTON (AP) — Back from a week abroad, President Donald Trump threw himself into the shutdown debate, calling on the Senate to scrap the filibuster and reopen the government, an idea swiftly rejected Friday by Republican leaders who have long opposed such a move.

Trump pushed his Republican Party to get rid of the Senate rule that requires 60 votes to overcome objections and gives the minority Democrats a check on GOP power. In the chamber that’s currently split, 53-47, Democrats have had enough votes to keep the government closed while they demand an extension of health care subsidies. Neither party has seriously wanted to nuke the rule.

“THE CHOICE IS CLEAR — INITIATE THE ‘NUCLEAR OPTION,’ GET RID OF THE FILIBUSTER,” Trump said in a late night social media post Thursday.

Trump’s sudden decision to assert himself into the shutdown hitting 32 days on Saturday — with his highly charged demand to end the filibuster — is certain to set the Senate on edge. It could spur senators toward their own compromise or send the chamber spiraling toward a new sense of crisis. Or, it might be ignored.

Republican leaders responded quickly, and unequivocally, setting themselves at odds with Trump, a president few have dared to publicly counter.

Senate Majority Leader John Thune has repeatedly said he is not considering changing the rules to end the shutdown, arguing that it is vital to the institution of the Senate and has allowed them to halt Democratic policies when they are in the minority.

The leader’s “position on the importance of the legislative filibuster is unchanged,” Thune spokesman Ryan Wrasse said Friday.

House Speaker Mike Johnson also defended the filibuster Friday, while conceding “it’s not my call,” from his chamber across the Capitol.

“The safeguard in the Senate has always been the filibuster,” Johnson said, adding that Trump’s comments are “the president’s anger at the situation.”