Trump made the comments on Twitter early Sunday while away on his first weekend trip to Camp David, the official US presidential retreat in the state of Maryland.
"The MAKE AMERICA GREAT AGAIN agenda is doing very well despite the distraction of the Witch Hunt," the Republican leader tweeted.
"Many new jobs, high business enthusiasm," he wrote Sunday, also pointing to his successful nomination of conservative justice Neil Gorsuch to the US Supreme Court. "Infrastructure, Healthcare and Tax cuts in the works!" he continued.
His latest remarks followed Trump's furious Twitter outburst on Friday in which he announced he is under investigation in connection with a probe into Russia’s alleged meddling in last year’s presidential election that has dogged the White House and has intensified in recent weeks.
A source on Trump's legal team claimed the president was referring to a Washington Post story "from the other night" rather than confirming he is being investigated.
The post was one of several news organizations that reported that Trump himself is being investigated on allegations of obstructing justice.
Trump is accused of firing FBI director James Comey over his refusal to steer the Russia investigation away from former national security advisor and Trump ally Mike Flynn.
The US president has denied trying to influence the investigation, but has acknowledged in an interview that Russia was on his mind when he dismissed Comey.
Trump left Saturday with his wife and young son to spend the weekend at Camp David for the first time, and is scheduled to return to Washington Sunday evening.