US President Donald Trump bitterly attacked top Democrat Nancy Pelosi on Sunday and she again insisted that he end the government shutdown before border security talks can begin, but there were hints of possible movement.

Trump lashed out on Twitter a day after Pelosi, speaker of the House of Representatives, dismissed as a “non-starter” his offer to extend temporary protection to about a million immigrants in return for $5.7 billion for the wall he wants on the Mexican border to fulfill a signature campaign promise.

Government shutdowns are a disruptive political ritual that have occurred in various administrations and are almost unique to the American system. But this one is the longest on record. It has left about 800,000 federal workers unpaid — among them airport security officers, FBI agents, museum workers, and Coast Guard members.

“Nancy Pelosi has behaved so irrationally & has gone so far to the left that she has now officially become a Radical Democrat,” the president tweeted. “She is so petrified of the ‘lefties’ in her party that she has lost control.”

It was Trump’s most direct attack on Pelosi since the partial government shutdown began, and appeared to reflect a mounting sense of frustration.