White House legislative director Marc Short said Sunday the Trump administration continues to cooperate with Special Counsel Robert Mueller’s Russia investigation.

Short’s assurance comes a day after John Dowd, a lawyer for President Trump, said Deputy Attorney General Rod Rosenstein should end the special counsel probe.

In recent days, Trump has said Mueller’s investigation of Russia’s 2016 election interference “should never have been started” and accused the special counsel’s team of political bias.

“I don't think that the president or anybody right now in our White House is suggesting not cooperating in any way with the Mueller investigation,” Short said on CBS’s “Face the Nation.” “We've cooperated in every single way."

Short said Trump and his team are expressing frustration with the length of Mueller’s probe, and he, like other White House officials, continued to claim there has been no evidence produced so far showing the campaign collaborated with Russia on election interference.

“The reality is that, yes, there's a growing frustration that after more than a year and millions of dollars spent on this, there remains no evidence of collusion with Russia,” Short said. “At some point, the American people are owed an answer to say, if there is no collusion, how much longer will be this drag on?"

The Mueller probe so far has produced the indictment of Trump’s former campaign chair, Paul Manafort, 13 Russians, and guilty pleas of several, including Trump’s former national security adviser Michael Flynn, a campaign foreign policy adviser and deputy campaign manager.