Republicans on the House Intelligence Committee have completed a draft report concluding there was no collusion or coordination between Donald Trump’s presidential campaign and Russia.

After a year-long investigation, Texas Representative Mike Conaway announced that the committee has finished interviewing witnesses and will share the report with Democrats for the first time on Tuesday.

Mr Conaway is the Republican leading the House probe, one of several investigations on Russian meddling in the 2016 elections, and previewed several of the report’s conclusions.

“We found no evidence of collusion,” Mr Conaway told reporters, suggesting that those who believe there was are reading too many spy novels.

“We found perhaps some bad judgment, inappropriate meetings, inappropriate judgment in taking meetings. But only Tom Clancy or Vince Flynn or someone else like that could take this series of inadvertent contacts with each other, or meetings or whatever, and weave that into sort of a fiction page turner, spy thriller.”

Mr Trump celebrated the findings. In an all-caps tweet on Monday evening, the president said the draft report shows “NO EVIDENCE OF COLLUSION OR COORDINATION BETWEEN THE TRUMP CAMPAIGN AND RUSSIA”.

The public will not see the report until Democrats have reviewed it and the intelligence community has decided what information can become public, a process that could take weeks. Democrats are expected to issue a separate report with much different conclusions.

In addition to the statement on coordination with Russians, the draft picks apart a central assessment made by the US intelligence community shortly after the 2016 election — that Russian meddling in the campaign was intended to help Mr Trump and hurt Democrat Hillary Clinton. Committee aides said they spent hundreds of hours reviewing raw source material used by the intelligence services to make that claim and that it did not meet the appropriate standards.

Trump Russia ProbeAfter a year-long investigation, Mike Conaway said the committee has finished doing witness interviews (Andrew Harnik/AP)

Mr Conaway said there will be a second report just dealing with the intelligence assessment and its credibility.

Democrats have criticised Republicans on the committee for shortening the investigation, pointing to multiple contacts between Mr Trump’s campaign and Russia and saying they have seen far too few witnesses to make any judgment on collusion.

The Democrats and Republicans have openly fought throughout the investigation, with Democrats suggesting a cover-up for a Republican president and one Republican member of the panel calling the probe “poison” for the previously bipartisan panel.

Trump Russia ProbeAdam Schiff criticised Republicans on the panel for wrapping up the probe (J Scott Applewhite/AP)

The top Democrat on the intelligence panel, California Representative Adam Schiff, suggested that by wrapping up the probe the Republicans were protecting Mr Trump. He called the development a “tragic milestone” and said history would judge them harshly.

Republicans “proved unwilling to subpoena documents like phone records, text messages, bank records and other key records so that we might determine the truth about the most significant attack on our democratic institutions in history,” Mr Schiff said.

According to Mr Conaway, the report will agree with the intelligence assessment on most details, including that Russians did meddle in the election. It will detail Russian cyberattacks on US institutions during the election and the use of social media to sow discord. It will also show a pattern of Russian attacks on European allies — information that could be redacted in the final report. It will blame officials in former President Barack Obama’s administration for a “lacklustre” response and look at leaks from the intelligence community to the media.

It will include at least 25 recommendations, including how to improve election security, respond to cyberattacks and improve counterintelligence efforts.

The report is also expected to turn the subject of collusion toward the Clinton campaign, saying an anti-Trump dossier compiled by a former British spy and paid for by Democrats was one way that Russians tried to influence the election. Mr Conaway did not suggest that Clinton knowingly coordinated with the Russians, but said the dossier clearly “would have hurt him and helped her”.

He also said there was no evidence that anything “untoward” happened at a 2016 meeting between members of the Trump campaign and Russians, though he called it ill-advised. Despite a promise of dirt on Mr Clinton ahead of the meeting, there’s no evidence that such material was exchanged, he said.