During a fiery rally in Michigan on Thursday, President Donald Trump renewed his attack on the House Intelligence Committee Chairman Adam Schiff.

To applause from an energized crowd, Trump mocked Schiff appearance by saying he had “the smallest, thinnest neck I’ve ever seen.” It was the president’s first political rally since the end of Robert Mueller's 22-month Russia investigation.

During one segment of his speech, Trump blasted Democratic Party officials and the media for consistently focusing on alleged conspiring with Russia.

A four-page summary produced by Attorney General William Barr said the final report found no evidence that Trump or his campaign conspired with Russia to influence the outcome of the 2016 presidential election but left the door open on obstruction of justice.

Trump fumed against Schiff, who has been at the center of Democrats' attacks on the White House administration. Schiff previously suggested that the president could face the “real prospect of jail time.

Trump said: “Many many people were badly hurt by this scam but more importantly our country was hurt. Our country was hurt. And they are artificial respirators right now.

“They are getting mouth to mouth resuscitation. Little pencil neck Adam Schiff. He’s got the smallest, thinnest neck I’ve ever seen. He is not a long ball hitter. I saw him today, ‘well we don't really know, there could have still been some Russia.’ Sick, these are sick people."

The president also said: “This group of major losers did not just ruthlessly attack me, my family and everyone who questioned their lies. They tried to divide our country. To poison the national debate and to tear up the fabric of our great democracy—the greatest anywhere.

“They did it all because they refuse to accept the results of one of the greatest presidential elections, probably number one, in our history,” Trump added.

Earlier this week, Trump demanded that Schiff resign from Congress.

“Congressman Adam Schiff, who spent two years knowingly and unlawfully lying and leaking, should be forced to resign from Congress!” he tweeted, in a post shared nearly 40,000 times.

Yesterday, nine Republicans on the House Intelligence Committee signed a letter calling for Schiff's resignation of the chairmanship—a demand the chairman met with defiance.

“Your actions both past and present are incompatible with your duty as chairman of this Committee... We have no faith in your ability to discharge your duties in a manner consistent with your constitutional responsibility,” the Republicans stated in their letter.

In the often testy exchange between House politicians, Schiff said: "I have always said that the question of whether this amounts to proof of conspiracy was another matter.

"Whether the special counsel could prove beyond a reasonable doubt the proof of that crime would be up to the special counsel, and I would accept his decision, and I do.

 "But I do not think that conduct, criminal or not, is OK. And the day we do, think that's OK, is the day we look back and say that is the day that America lost its way."

Chairman Adam Schiff (D-CA) Michael Cohen, speaks to the media after a closed door House Intelligence Committee hearing where Michael Cohen, former attorney and fixer for President Donald Trump, testified on Capitol Hill February 28, 2019 in Washington, DC. Mark Wilson/Getty Images