President Donald Trump on Friday declared Senate Republicans “can’t get” 60 votes in the Senate and again urged GOP leaders to alter rules for major legislation.

He followed his Twitter rant against Senate Republicans with his first comments on Friday’s terrorist attack in London to criticize British security officials.

Trump has urged Senate Majority Leader Mitch McConnell to change the chamber’s rules so legislation can be passed with 51 votes before, something the Kentucky Republican and his caucus oppose. But Friday morning’s tweet came as Trump is openly courting Democratic votes, eager to pass a tax bill with Democratic support.

He will need at least eight Senate Democrats to do, and his latest railing against the 60-vote rule casts new doubt on whether he can get enough Democrats on the coming tax measure.

The president called the legislative filibuster rule “ridiculous,” and tweeted this about Senate Republicans’ ability to get to 60: “Can’t get votes, END NOW!”