President Trump said Friday morning it was "sad" that investigators haven't been able to find proof that his presidential campaign colluded with the Russians after months of investigations.

"After 7 months of investigations & committee hearings about my ‘collusion with the Russians,' nobody has been able to show any proof. Sad!" Trump said on his Twitter account Friday.

"Despite the phony Witch Hunt going on in America, the economic & jobs numbers are great. Regulations way down, jobs and enthusiasm way up!" he said in a second tweet.

The FBI, as well as the House and Senate Intelligence Committees, are conducting probes into whether Trump campaign officials colluded with the Russian government during the 2016 election.

So far, there hasn't been any evidence of the two working together.

Trump has taken to Twitter on multiple occasions to dismiss the Russia investigation, calling it a "witch hunt" and asserting that the media has missed the "big story" of the probe: the Obama administration's "unmasking and surveillance" of Americans.

On Thursday, Trump fired off several tweets regarding the Russia investigation after the Washington Post reported that special counsel Robert Mueller, who is leading the probe, is also investigating the president for obstruction of justice.

"They made up a phony collusion with the Russians story, found zero proof, so now they go for obstruction of justice on the phony story. Nice," Trump tweeted Thursday morning.

He later questioned why the FBI and Justice Department weren't probing Hillary Clinton's family and other Democrats for their own "dealings" with Russia.

"Why is that Hillary Clintons family and Dems dealings with Russia are not looked at, but my non-dealings are?" Trump said Thursday afternoon. "Crooked H destroyed phones w/ hammer, 'bleached' emails, & had husband meet w/AG days before she was cleared- & they talk about obstruction?"

Investigators began looking into the president's actions last month, days after he fired former FBI Director James Comey.

The White House said it's likely Trump's tweets were prompted by the news that Mueller was looking into whether the president obstructed justice.

"There were some developments yesterday," White House deputy press secretary Sarah Sanders said when asked what provoked Trump's tweets.