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’s lawyers on Monday filed a brief urging the Senate to "swiftly" reject the impeachment charges against him, casting the articles as "flimsy" and accusing House Democrats of a partisan effort to damage Trump ahead of the 2020 election.

"The Articles of Impeachment now before the Senate are an affront to the Constitution and to our democratic institutions. The Articles themselves—and the rigged process that brought them here—are a brazenly political act by House Democrats that must be rejected," Trump's lawyers, led by White House counsel Pat Cipollone and Trump’s personal attorney, Jay Sekulow Jay Alan SekulowNow, we need the election monitors Judge denies Trump's request for a stay on subpoena for tax records Judge throws out Trump effort to block subpoena for tax returns MORE, wrote in a lengthy brief filed Monday afternoon.

The 110-page filing accuses House Democrats of crafting two articles that do not allege impeachable offenses and using impeachment as "a political tool to overturn the result of the 2016 election and to interfere in the 2020 election."

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The president’s attorneys also characterize the House process as “irredeemably flawed,” citing the lack of vote authorizing the impeachment inquiry at the outset and claiming Trump was not afforded due process.

"All of this is a dangerous perversion of the Constitution that the Senate should swiftly and roundly condemn," the legal brief states.

Trump’s attorneys assert that the articles of impeachment themselves — abuse of power and obstruction of Congress — are flawed because they do not allege a crime, arguing they do not meet the standard of “high crimes and misdemeanors” put forth in the Constitution.

They claim House Democrats are trying to remove Trump from office over “policy disagreements” regarding his dealings with Ukraine.

“House Democrats’ novel theory of ‘abuse of power’ improperly supplants the standard of ‘high Crimes and Misdemeanors’ with a made-up theory that would permanently weaken the Presidency by effectively permitting impeachments based merely on policy disagreements,” the filing reads.

The president’s attorneys also argue that Trump was asserting the constitutional privileges of the executive branch by instructing top aides not to comply with congressional subpoenas for their testimony, calling the obstruction charge “frivolous and dangerous.”

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Accepting the Democrats' argument, Trump’s lawyers write, “would do lasting damage to the separation of powers.”

The brief marks Trump’s lawyers first robust response to the accusations against the president and offers a preview of arguments that they will employ during the Senate trial. It was filed two days after House Democrat impeachment managers unveiled their own brief laying out the “compelling case” against Trump and urging the Senate to vote to convict and remove him from office.

“President Trump’s ongoing pattern of misconduct demonstrates that he is an immediate threat to the Nation and the rule of law. It is imperative that the Senate convict and remove him from office now, and permanently bar him from holding federal office,” they wrote, labeling Trump’s conduct “the Framers' worst nightmare.”

Democrats allege Trump sought to pressure Ukraine to publicly announce investigations that could benefit his reelection campaign and used a White House meeting and security assistance to Kyiv to do so.

The case revolves around a July 25 phone call during which Trump asked Ukrainian President Volodymyr Zelensky to investigate a debunked theory that Ukraine, not Russia, interfered in the 2016 election as well as an unfounded claim about former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE and his son Hunter’s business dealings in Ukraine.

Trump has insisted he did not pressure Ukraine and characterized the call as “perfect.”

The filing submitted Monday dismisses House Democrats’ case as relying on secondhand evidence and claims the rough transcript of the call released by the White House “shows that the President did nothing wrong.”

The attorneys do not deny that Trump sought investigations into 2016 election interference and the Bidens, but they argue that Trump had legitimate reason to raise the issues on the phone call with Zelensky.

The brief also seeks to cast doubt on testimony from U.S. Ambassador to the European Union Gordon Sondland Gordon SondlandGOP chairman vows to protect whistleblowers following Vindman retirement over 'bullying' Top Democrat slams Trump's new EU envoy: Not 'a political donor's part-time job' Trump names new EU envoy, filling post left vacant by impeachment witness Sondland MORE that linked the Ukraine security assistance to the pursuit of the investigations, and describes Democrats’ case as reliant on “hearsay and speculation.”

It cites statements from Sondland and Sen. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill Second GOP senator to quarantine after exposure to coronavirus GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE (R-Wis.) about Trump’s own comments to support the assertion that the president never sought to trade the meeting or security assistance for the investigations.

Trump has said publicly that he ordered a hold on the $391 million in military assistance because he was concerned about corruption and European countries not contributing enough to Ukraine.

His acting chief of staff, Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE, said during a news conference last October that the administration suspended the aid in part because it wanted Ukraine to investigate the debunked theory Kyiv was involved in the 2016 Democratic National Committee server hack, remarks he later walked back.

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Trump’s lawyers issued their first formal response to the Senate on Saturday, in the form of a six-page letter.

The Democrat-controlled House voted in December to approve two articles of impeachment accusing Trump of abusing his power in his dealings with Ukraine and obstructing the congressional inquiry into his conduct.

The trial in the GOP-controlled Senate is slated to begin in earnest on Tuesday, when senators will debate and vote on a resolution to set the rules for the proceedings.

The Senate is widely expected to acquit Trump given its Republican majority, however revelations since the House approved the articles have increased pressure on senators to consider witnesses in the trial – something Democrats have pushed for but the White House and many Republicans have resisted.

Lev Parnas, an indicted former associate of Trump attorney Rudy Giuliani Rudy GiulianiGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Juan Williams: Breaking down the debates Giuliani criticizes NYC leadership: 'They're killing this city' MORE, has made a series of explosive allegations against Trump and his inner circle related to the Ukraine affair in recent days, in addition to supplying House Democrats with new documentary evidence.

Last week, the Government Accountability Office (GAO) also accused the Trump administration of breaking the law on temporarily suspending the security assistance to Ukraine, which had been appropriated by Congress.

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Without mentioning those new revelations, Trump’s lawyers wrote Monday that the Senate “cannot expand the scope of a trial to consider mere assertions appearing in House reports that the House did not include in the articles of impeachment.”

A source working with the president’s legal team also dismissed the idea that the GAO report could be considered during the trial, while also disagreeing with the judgment issued by the nonpartisan watchdog.

“We’re going to trial on a specific set of charges,” the person said. “That’s not properly part of the accusation that has been brought to the Senate.”

Cipollone and Sekulow are leading the president's team of lawyers. The White House announced Friday that several other high-profile figures would also play a role in the trial, including Harvard law professor emeritus Alan Dershowitz Alan Morton DershowitzDershowitz suing CNN for 0 million in defamation suit Bannon and Maxwell cases display DOJ press strategy chutzpah Ghislaine Maxwell attorneys ask for delay to unseal court documents due to 'critical new information' MORE and Ken Starr, the former special counsel who investigated President Bill Clinton William (Bill) Jefferson ClintonBarr says Ginsburg 'leaves a towering legacy' Trump reacts to Ginsburg's death: 'An amazing woman who led an amazing life' Jimmy Carter remembers Ruth Bader Ginsburg as 'a beacon of justice' MORE.

--This report was last updated at 2:51 p.m.