WASHINGTON — Senate Majority Leader Mitch McConnell on Tuesday expressed confidence in special counsel Robert Mueller and said he should be allowed to “finish his job,” the Senate leader’s first response to President Donald Trump’s recent outburst of criticism of Mueller and his investigation into Russian interference in the 2016 election.

“I think he will have great credibility with the American people when he reaches a conclusion of this investigation,” McConnell said. “So I have a lot of confidence in him.”

McConnell was silent through the weekend as other Republicans alternately criticized Trump for his series of tweets and expressed faith that he would not move to have Mueller removed. House Speaker Paul Ryan said Tuesday he had “received assurances” that Mueller would not be fired.

Trump blistered Mueller and his investigation all weekend on Twitter and started in again Monday, questioning the probe’s legitimacy with language no recent president has used for a federal inquiry. “A total WITCH HUNT with massive conflicts of interest!” Trump tweeted.

Mueller is leading a criminal probe into whether Trump’s 2016 presidential campaign had ties to Russia and whether there has been obstruction of justice since then.

White House officials and Trump’s lawyers repeatedly said over the weekend that Mueller would not be fired. White House press secretary Sarah Huckabee Sanders said Tuesday that the White House does not think firing Mueller would be “the most productive step forward,” but that they want to see the investigation come to an end. She said Trump’s tweets were about his frustration with the process.

Trump has fumed to confidants that the Mueller probe is “going to choke the life out of” his presidency if allowed to continue, according to an outside adviser who spoke on condition of anonymity.

Such notable Republicans as Trey Gowdy, chairman of the House Oversight and Government Reform Committee, and Bob Corker, chairman of the Senate Foreign Relations Committee, have told Trump to cut it out. And Orrin Hatch, chairman of the Senate Finance Committee, said Monday that firing Mueller would be “the stupidest thing the president could do.”

Still, GOP lawmakers said they didn’t think it was necessary to pass bipartisan bills to protect the special counsel.

Trump cannot directly fire Mueller. Any dismissal, for cause would have to be carried out by Deputy Attorney General Rod Rosenstein, who appointed the counsel and has continued to express support.