House Democrats argued Friday that President Trump improperly obstructed Congress’ probe of his interactions with Ukraine — their final day of openings in the impeachment trial before Republicans take up his defense against the charges.

The seven Democratic managers, led by Rep. Adam Schiff, a former federal prosecutor and chair of the House Intelligence Committee, were trying to make the case to the GOP-led Senate — and the American public — that Trump is guilty of obstructing Congress for allegedly withholding key witnesses and documents from lawmakers.

New York Rep. Hakeem Jeffries told the senators that the president got caught asking Ukraine’s government to dig up dirt on former veep Joe Biden, the frontrunner so far for the 2020 Democratic presidential nomination — and then tried to cover it up.

“At the heart of [the Constitution’s] Article 2, obstruction of Congress, is a simple troubling reality. President Trump tried to cheat. He got caught, and then he worked hard to cover it up,” Jeffries said.

“By July of 2019, White House officials were aware of serious allegations of misconduct by President Trump regarding Ukraine.

But instead of halting the president’s corrupt scheme, they worked overtime to conceal it from the American people,” Jeffries continued.

Republicans were equally complicit in what he called the cover-up, he asserted.

“As additional evidence mounted, the Republicans worked hard to keep the American people from learning about the president’s misconduct,” he said.

Trump persisted even after Secretary of State Mike Pompeo, Defense Secretary Mike Esper and former National Security Adviser John Bolton tried to convince him to lift the hold on the security assistance, he said.

“They failed. President Trump was determined to carry out this corrupt scheme. The Ukraine security aid was only released on September 11, after the hold became public, after the House launched an investigation, and after Congress learned about the existence of a whistleblower complaint,” Jeffires said.

“The $391 million in security aid was only released because President Trump was caught red-handed,” he declared.

“There’s a toxic mess at 1600 Pennsylvania Ave., and I humbly suggest that it’s our collective job on behalf of the American people to try to clean it up.”

In a July 25 phone call, Trump pressed Ukrainian President Volodymyr Zelensky to investigate Biden and his son Hunter, who served on the board of Ukrainian energy company Burisma.

Colorado Rep. Jason Crow echoed Jeffries that Trump only released the aid because he got caught — and scoffed at the GOP’s defense that since it was ultimately released, “so therefore no harm, no foul.”

“This defense would be laughable if this issue wasn’t so serious,” said Crow, a US Army vet who served in Afghanistan.

“First, I’ve spoken over the past three days about the real consequences of inserting politics into matters of war. Real people, real lives are at stake every day. Every hour matters. So, no, the delay wasn’t meaningless. Just ask the Ukrainians sitting in trenches right now.”

Schiff before the afternoon break also excoriated Trump’s statements in Helsinki, when he questioned the US intelligence community’s conclusion that Russia had meddled in the while appearing to back Vladimir Putin’s denials as he stood next to the Russian strongman.

“This is just the most incredible propaganda coup [for Russia] because as I said yesterday, it’s not just that the president of the United States standing next to Vladimir Putin is reading Kremlin talking points,” Schiff said.

“He won’t read his own national security staff talking points, but he will read the Kremlin ones,” he added.

During the break, Trump’s lawyer Jay Sekulow said that neither of the president’s high-profile TV lawyers, Ken Starr or Alan Dershowitz, would appear during the proceedings until next week and that Saturday’s session would run from just 10 a.m. to about 1 p.m. and serve as preview of the defense.

“I think that you will see, I guess we would call it a trailer, and a coming attractions would be the best way to say it, and obviously, three hours to put it out, so we will take whatever time is appropriate in the three hours to lay out how the case is going to look like and next week is the full presentation,” he said.

He also mentioned the much-maligned “Steele Dossier” from the Russia probe as a reason Trump was skeptical of his own intelligence community.

“There was all this discussion about why was the president so suspicious of some of his intelligence information, some of the leaders he was dealing with within his own government,” an animated Sekulow declared.

He railed against “the No. 3 at the Department of Justice,” referring to Bruce Ohr, whose wife Nellie “was working for a firm that was working on a dossier against the sitting president of the United States. Let me be crystal clear, yeah, we’re concerned about it.”

The Dems were also expected to argue that Trump refused to cooperate with the House probe of the matter by directing officials to ignore Democratic requests to testify and for relevant documents.

Key administration officials who refused to comply with subpoenas in the probe included Vice President Mike Pence, White House acting Chief of Staff Mick Mulvaney and Pompeo.

Bolton refused a request by the House to testify, but later said he would testify in the Senate if subpoenaed.

Democrats sought to have Bolton testify in the trial, but senators voted along party lines on Tuesday against all Democrats’ proposed witnesses.

White House counsel Pat Cipollone, a member of Trump’s legal team, has accused Democrats of using the impeachment process to try to “steal” the 2020 election and said the president had a constitutional right to keep aides from testifying.

The Democratic-led House on Dec. 18 impeached Trump on the obstruction charge and a separate charge of abuse of power for allegedly trying to coerce Ukraine’s government into digging up dirt on former veep Joe Biden, the frontrunner so far for the 2020 Democratic presidential nomination.

The impeachment trial in the Senate, just the third in US history, will determine whether Trump is ousted from power less than 10 months before he faces re-election.

Trump adamantly denies any wrongdoing, while his GOP allies argue his conduct does not rise to the level of an impeachable offense even if he did what the Democrats have accused him of.

Once Democrats conclude their opening arguments, Trump’s legal team will have up to 24 hours over three days to mount a defense, beginning with the short session Saturday. There will be no trial Sunday, and it will resume Monday at 1 p.m.

Senate Republicans are expected to acquit him. A two-thirds vote of the chamber is required to eject him from office.

Trump on Friday retweeted dozens of supporters who repeated his criticism of the proceedings as unfair and politically motivated.

The president also complained his lawyers would have to begin arguments on Saturday, when, he said, nobody watches TV.

“Looks like my lawyers will be forced to start on Saturday, which is called Death Valley in T.V.,” Trump tweeted.

As the trial neared the end of its first week, there was little sign that Senate Republicans were being persuaded by the Democratic case.

Democrats spent Thursday meticulously detailing their allegations that Trump only grew interested in corruption in Ukraine when it appeared that Biden could become a serious political threat.

During the proceedings, Democrats have argued the Senate should allow new witnesses such as Bolton to testify.

Republicans have resisted their push but have threatened to call a witness such as Joe or Hunter Biden in retaliation.