The Republican attorneys general of Georgia, Florida and Alabama joined those from a total of 21 states Wednesday in a 14-page message to the U.S. Senate condemning the impeachment of President Donald Trump.

The AGs called the articles of impeachment legally flawed and detailed their reasoning in what they called a "friend of the Senate" letter.

"As Attorneys General of 21 States whose citizens and Electoral College delegates voted in the 2016 presidential election, we have a special duty to defend the integrity of the votes cast by those citizens and electors during that election," the AGs said in the letter. "However, our interests go well beyond that particular election. This impeachment proceeding threatens all future elections and establishes a dangerous historical precedent."

The impeachment would "erode the separation of powers shared by the executive and legislative branches by subjugating future Presidents to the whims of the majority opposition party in the House of Representatives," the AGs said. "Thus, our duty to current and future generations commands us to urge the Senate to … reject the two articles of impeachment contained in H. Res. 755."

The AGs said the "abuse of power" and "obstruction of Congress" allegations are "lacking in any plausible or reasonable evidentiary basis" on top of being "fundamentally flawed as a matter of constitutional law."

AGs Chris Carr of Georgia, Ashley Moody of Florida and Steve Marshall of Alabama signed the letter. AG Ken Paxton of Texas also signed.

"As the chief legal officers of our states, my colleagues and I felt it important at this time to weigh in and voice our objection to the legal and factual underpinnings of these impeachment proceedings," Carr said in a news release Wednesday. "The legal theories underlying both Articles I and II are not only flawed, they are inherently destructive of separation of powers, contrary to the Framers' vision of impeachment power and will set a dangerous precedent."

Carr has posted a copy of the letter on his website.

"The Framers of our Constitution hesitated to give Congress impeachment power over the President for fear of it being used for political disagreements or as a partisan weapon and expertly crafted it so it could not, and we believe the Senate must expressly reject the articles of this impeachment to protect the office of the President and the Constitution," Carr said.