The investigations into alleged ties between the Trump campaign and Russia's election meddling has complicated the House Intelligence Committee's annual hearing on the U.S. global threat assessment, Democratic sources tell Reuters.

The sources told the news organization that Republican leaders have not moved to schedule the hearing.

The hearing would involve key leaders of the intelligence community, who would most likely be asked by Democrats about "material omissions of fact" that the FBI found in the classified memo released by Republicans on the House Intelligence Committee earlier this month, which alleges surveillance abuses at the Justice Department.

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None of the intelligence community directors have received invitations to the hearing, an unnamed U.S. official revealed to Reuters.

The reported dispute on the House committee is the latest sign of a divide over the intelligence community's conclusion that Russia meddled in the 2016 presidential election.

President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE has repeatedly called the congressional probes and the investigation by special counsel 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 into possible collusion between Russia and the Trump campaign a “witch hunt.”

The president says there was no collusion between Russia and his campaign.

The report comes days after FBI Director Christopher Wray, CIA Director Mike Pompeo Michael (Mike) Richard PompeoHouse panel halts contempt proceedings against Pompeo after documents turned over Outgoing ambassador to China slams Beijing over coronavirus: 'Could have been contained in Wuhan' Hillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers MORE, and Director of National Intelligence Dan Coats Daniel (Dan) Ray CoatsFBI chief says Russia is trying to interfere in election to undermine Biden The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Former Intel chief had 'deep suspicions' that Putin 'had something on Trump': book MORE presented the 2018 Worldwide Threat Assessment before the Senate Intelligence Committee.

Coats told that committee that there “should be no doubt” that Russia believes it was successful in influencing the 2016 election, and that it is aiming to similarly target the 2018 midterm elections.

Wray revealed to the Senate committee that Trump has not directed him to stop the Russian efforts targeting this year's contests.