President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE barreled into the workweek on Tuesday with a series of tweets signaling his still-boiling frustration with the investigation into Russian meddling in the 2016 presidential race and a fervent push to boost Republicans in this year's midterm elections.

Trump returned to Washington on Monday night after three days at his Mar-a-Lago estate in Florida, where he vented his anger over the Russia probe and blamed former President Barack Obama Barack Hussein ObamaMomentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina Majority of voters say Trump should not nominate a Supreme Court justice: poll MORE for not doing enough to address concerns about Moscow's interference in the election.

Those frustrations resurfaced early Tuesday, as Trump delivered a full-throated rebuke of the Obama administration's posture toward Russia and called into question his predecessors motives during the 2016 presidential race.

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Trump's tweets were the latest sign that he remains focused on the Russia investigation after Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE, the special counsel investigating Moscow's role in the 2016 election, unsealed indictments against 13 Russian nationals and three Russian companies accused of meddling in the race.

Trump stewed over the investigation throughout the weekend, even as he traveled to Florida to visit with the families of the victims of a deadly shooting at a high school in Parkland, Fla. Between Friday and Monday, the president took to Twitter more than a dozen times to comment on the Russia probe.

For Trump, a frequent viewer of cable news, his frustration appeared to be sparked, at least in part, by the Tuesday-morning airing of "Fox & Friends."

In one tweet, Trump offered a shoutout to the show for putting together a "timeline" of the Obama administration's "failures" to address Russian aggression in Ukraine, Syria and elsewhere.

"Thank you to @foxandfriends for the great timeline on all of the failures the Obama Administration had against Russia, including Crimea, Syria and so much more. We are now starting to win again!" Trump tweeted.

Thank you to @foxandfriends for the great timeline on all of the failures the Obama Administration had against Russia, including Crimea, Syria and so much more. We are now starting to win again! — Donald J. Trump (@realDonaldTrump) February 20, 2018

Another tweet seized on a 2016 quote from Obama that was played on "Fox & Friends" Tuesday morning, in which the former president appeared to wave off concerns about untoward influence in the election.

Trump accused Obama of declining to act on warnings about Russia from the U.S. intelligence community because he believed Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE would win the race. He later claimed that he is "much tougher" on Russia than his predecessor ever was.

“There is no serious person out there who would suggest somehow that you could even rig America’s elections, there’s no evidence that that has happened in the past or that it will happen this time, and so I’d invite Mr. Trump to stop whining and make his case to get votes.” ..... — Donald J. Trump (@realDonaldTrump) February 20, 2018

....The President Obama quote just before election. That’s because he thought Crooked Hillary was going to win and he didn’t want to “rock the boat.” When I easily won the Electoral College, the whole game changed and the Russian excuse became the narrative of the Dems. — Donald J. Trump (@realDonaldTrump) February 20, 2018

I have been much tougher on Russia than Obama, just look at the facts. Total Fake News! — Donald J. Trump (@realDonaldTrump) February 20, 2018

The law enforcement investigation into Russia's role in the election, as well as whether members of the Trump campaign conspired with Moscow to help sway the race, has long been a source of frustration for the president, who has decried it as a "witch hunt" and a cloud over his administration.

Trump has denied that he or anyone else on his campaign coordinated with Russia, referring to the intelligence assessment that Moscow sought to elect him and smear Clinton as a "hoax."

But the indictment unsealed on Friday painted a detailed picture of a foreign government's efforts to help elect a U.S. president — an idea that Trump has bristled at, in the past.

Trump's thoughts on Tuesday morning also appeared to turn to this year's midterm elections.

He touted an unnamed poll showing Republican candidates leading on the generic congressional ballot, crediting a sweeping series of tax cuts he signed in December with boosting his party's prospects.

And in another tweet, Trump encouraged Pennsylvania Republicans to challenge a new congressional map unveiled a day earlier, saying that the previous map — deemed unconstitutional by the state Supreme Court — "was correct."

Republicans are now leading the Generic Poll, perhaps because of the popular Tax Cuts which the Dems want to take away. Actually, they want to raise you taxes, substantially. Also, they want to do nothing on DACA, R’s want to fix! — Donald J. Trump (@realDonaldTrump) February 20, 2018

Hope Republicans in the Great State of Pennsylvania challenge the new “pushed” Congressional Map, all the way to the Supreme Court, if necessary. Your Original was correct! Don’t let the Dems take elections away from you so that they can raise taxes & waste money! — Donald J. Trump (@realDonaldTrump) February 20, 2018

The tweets appeared aimed at bolstering Republicans ahead of the midterm elections after a particularly shaky week for the White House. Democrats are angling to take back control of the House in 2018, and their hopes have been boosted by White House scandals and Trump's low approval ratings.