Sen. Richard Blumenthal, D-Conn., said a subpoena might be "unavoidable" to get President Donald Trump to be interviewed with regards to special counsel Robert Mueller’s probe into Russian interference in the 2016 election.

"I think that a subpoena for Donald Trump seems increasingly necessary and unavoidable because apparently the advice he's receiving now is he should not be interviewed. But Robert Mueller is not going to finish this investigation without sitting down face to face with the president of the United States," Blumenthal said Thursday on MSNBC’s "Morning Joe."



Blumenthal dismissed the idea that Trump team lawyer Rudy Giuliani could provide Mueller with a time limit for how long he could talk to the president. "The idea that this interview is going to be limited to two or three hours or that it will be restricted in terms of the scope is absolutely absurd. Donald Trump is at the very least a subject and the line between being a subject and a target is very easily crossed," Blumenthal said.

Trump and his team could face obstruction charges, Blumenthal said. "The American president right now, President Trump, is refusing to cooperate in a lawful investigation. He is engaging in obstruction of justice in plain view, unfolding in real time, and I’m hoping that my colleagues in Congress will stand up and speak out," the senator said.

The president will have to face Mueller’s questioning, Blumenthal said Wednesday on CNN’s "Situation Room."

"The president of the United States has really boxed himself into a corner, because he has lied repeatedly and consistently in public," Blumenthal said.