President Trump lashed out at Democrats for promoting the Russia investigation that has entangled members of his administration, calling it an “excuse for losing the election.”

​”Since the first day I took office, all you hear is the phony Democrat excuse for losing the election, Russia, Russia,Russia. Despite this I have the economy booming and have possibly done more than any 10 month President. MAKE AMERICA GREAT AGAIN!​,” Trump posted on Twitter Sunday.​

The president was returning to Washington, DC, Sunday afternoon after spending the Thanksgiving holiday at his private Mar-a-Lago resort in Palm Beach, Fla.​

Special counsel Robert Mueller, who is probing Russian involvement in the 2016 election and any connections to the Trump presidential campaign, is systematically interviewing former and current members of the Trump White House.

He ​has already called in former White House chief of staff Reince Priebus and former White House press secretary Sean Spicer.

​In the coming weeks, he’s expected to interview White House communications director Hope Hicks and White House counsel Don McGahn.

Last month, Mueller’s team released indictments against Trump’s former campaign chairman Paul Manafort and his business associate Rick Gates for laundering millions of dollars while working for a Ukrainian politician with ties to Russian President Vladimir Putin.

Manafort and Gates have pleaded not guilty.

At the same time, Mueller announced that George Papadopolous, a former foreign policy adviser to the Trump campaign, pleaded guilty to lying to the FBI about his contact with Russian officials.

And last week, reports said Trump’s former national security adviser, Michael Flynn, told lawyers representing him in the Russia probe to no longer share information with Trump’s attorneys.