Trump starts workweek with tweetstorm

President TrumpDonald John TrumpNational Archives says it altered Trump signs, other messages in Women's March photo Dems plan marathon prep for Senate trial, wary of Trump trying to 'game' the process Democratic lawmaker dismisses GOP lawsuit threat: 'Take your letter and shove it' 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 ObamaBarack Hussein ObamaNational Archives says it altered Trump signs, other messages in Women's March photo Climate 'religion' is fueling Australia's wildfires Biden's new campaign ad features Obama speech praising him 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 MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay 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.

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 ClintonHillary Diane Rodham ClintonSupreme Court agrees to hear 'faithless elector' cases Poll: Sanders holds 5-point lead over Buttigieg in New Hampshire Climate 'religion' is fueling Australia's wildfires MORE would win the race. He later claimed that he is "much tougher" on Russia than his predecessor ever was.

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."

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.