Trump 'handled it brilliantly' with Putin, Mnuchin says

Mnuchin said Trump "fully addressed" Russia's alleged election meddling.

"He focused on the cease-fire in Syria, which is a major accomplishment. He talked about Ukraine and he talked about North Korea. So this was a very substantive meeting,” Mnuchin said on "This Week."

Stephanopoulos also asked if the president accepted the Russian leader's denial of having meddled in the U.S. election.

Mnuchin replied, "Why would President Trump broadcast exactly what he said in the meeting? Strategically that makes no sense."

"The president absolutely did not believe the denial of President Putin," Priebus said on "Fox News Sunday." "What the president did is he immediately came into the meeting, talked about Russia meddling in the U.S. election, went after that issue at least two separate times. This was not just a five minute piece of the conversation."

When pressed by Stephanopoulos on whether that means additional sanctions against Russia are off the table, Mnuchin said, "We have sanctions that are already on the table and we expect to enforce those sanctions."

The treasury secretary said the White House is "absolutely committed to getting tax reform done this year."

"Our plan is to have a full-blown release of the plan in the beginning of September, with being able to vote and getting this passed before the end of the year," said Mnuchin.