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Trump urges Senate to reject impeachment as affront to US Constitution

WASHINGTON, Jan 20 (Reuters) - President Donald Trump's lawyers argued on Monday that the impeachment case against him is a product of a rigged process by Democrats and "must be rejected" in the Senate trial that gets under way in earnest on Tuesday.

An executive summary of Trump's pre-trial brief for the Senate proceedings urges the Republican-led Senate to quickly acquit the president on two articles of impeachment approved against him by the Democratic-controlled House of Representatives.

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Trump rally in Milwaukee

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President Donald Trump points to the crowd after speaking during a campaign rally at UW-Milwaukee Panther Arena, Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/ Evan Vucci)

President Donald Trump applauds after speaking during a campaign rally at UW-Milwaukee Panther Arena, Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/ Evan Vucci)

President Donald Trump speaks during a campaign rally at UW-Milwaukee Panther Arena, Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/ Evan Vucci)

President Donald Trump speaks at a campaign rally Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/Jeffrey Phelps)

President Donald Trump arrives for a campaign rally Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/Jeffrey Phelps)

Supports cheer President Donald Trump during a campaign rally Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/Jeffrey Phelps)

Supports cheer before a campaign rally for President Donald Trump Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/Jeffrey Phelps)

President Donald Trump speaks at a campaign rally Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/Jeffrey Phelps)

President Donald Trump points to the crowd after speaking during a campaign rally at UW-Milwaukee Panther Arena, Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/ Evan Vucci)

President Donald Trump arrives at UW-Milwaukee Panther Arena to speak at a campaign rally, Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/ Evan Vucci)

Supporters of President Donald Trump cheer as he arrives for a campaign rally at UW-Milwaukee Panther Arena, Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/ Evan Vucci)

President Donald Trump speaks during a campaign rally at UW-Milwaukee Panther Arena, Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/ Evan Vucci)

President Donald Trump speaks during a campaign rally at UW-Milwaukee Panther Arena, Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/ Evan Vucci)

Supporters of President Donald Trump cheer as he arrives for a campaign rally at UW-Milwaukee Panther Arena, Tuesday, Jan. 14, 2020, in Milwaukee. (AP Photo/ Evan Vucci)

MILWAUKEE, WISCONSIN, USA - JANUARY 14 : U.S. President Donald Trump makes a speech at Keep America Great Rally in Milwaukee, WI, United States on January 14, 2020. (Photo by Kyle Mazza/Anadolu Agency via Getty Images)

MILWAUKEE, WISCONSIN, USA - JANUARY 14 : U.S. President Donald Trump arrives to delivering a speech at Keep America Great Rally in Milwaukee, WI, United States on January 14, 2020. (Photo by Kyle Mazza/Anadolu Agency via Getty Images)

MILWAUKEE, WISCONSIN, USA - JANUARY 14 : U.S. President Donald Trump arrives to delivering a speech at Keep America Great Rally in Milwaukee, WI, United States on January 14, 2020. (Photo by Kyle Mazza/Anadolu Agency via Getty Images)

MILWAUKEE, WI - JANUARY 14: U.S. Vice President Mike Pence gives the thumbs up as he speaks at a rally held by U.S President Donald Trump on January 14, 2020 at UWMilwaukee Panther Arena in Milwaukee, Wisconsin. Trump, who is the third president to face impeached, now faces an impending trial in the Senate. (Photo by Joshua Lott/Getty Images)

MILWAUKEE, WI - JANUARY 14: Attendees cheer as U.S. President Donald Trump speaks at a rally on January 14, 2020 at UWMilwaukee Panther Arena in Milwaukee, Wisconsin. Trump, who is the third president to face impeached, now faces an impending trial in the Senate. (Photo by Joshua Lott/Getty Images)

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"The Senate should speedily reject these deficient articles of impeachment and acquit the president," said the summary, released on Monday.

It called the charges an "affront to the Constitution and our democratic institutions," and said the obstruction of Congress charge was "frivolous and dangerous."

(Reporting By Steve Holland, editing by Ross Colvin)