Speaking to reporters, Jay Sekulow, President Donald Trump's personal lawyer, attacks the Democrat's arguments in the impeachment trial of the president on charges of abuse of power and obstruction of Congress, in Washington, Friday, Jan. 24, 2020. (AP Photo/J. Scott Applewhite)

WASHINGTON (AP) — Closing out their case, House Democrats warned Friday in Donald Trump’s impeachment trial that the president will persist in abusing his power and endangering American democracy unless Congress intervenes to remove him before the 2020 election.

They then implored Republican senators to allow new testimony before rendering a final verdict.

“Give America a fair trial,” said Rep. Adam Schiff, the lead Democratic impeachment manager. “She’s worth it.”

Schiff delivered Democrats’ final remarks in the Senate trial after three days of methodical and impassioned arguments detailing charges that Trump abused power by asking Ukraine for politically motivated probes of political rivals, then obstructed Congress’ investigation into the matter. The president’s lawyers get their first chance to defend him Saturday, and are expected to argue he acted appropriately.

The House impeached Trump last month, accusing him of abusing his office by asking Ukraine for politically motivated probes of former Vice President Joe Biden and other matters while withholding military aid from a U.S. ally that was at war with bordering Russia. A second article of impeachment accuses him of obstructing Congress by refusing to turn over documents or allow officials to testify in the House ensuing probe.

Said Trump attorney Jay Sekulow, “We’re going to rebut and refute, and we’re

going to put on an affirmative case tomorrow.”

Republicans are defending Trump’s actions as appropriate and are casting the impeachment trial as a politically motivated effort to weaken him in his reelection campaign. Republicans hold a 53-47 majority in the Senate, and eventual acquittal is considered likely.

Before that, senators will make a critical decision next week on Democratic demands to hear testimony from top Trump aides.

With Chief Justice John Roberts presiding, Friday’s session opened with an overarching case from Democrats that Trump’s actions with Ukraine were not unique but part of a pattern of “destructive behavior” now threatening the core foundations of American democracy.

Schiff told the senators Trump has shown repeatedly he is willing to put his personal political interests above those of the country he is sworn to protect.

The evidence, he said, shows Trump bucked the advice of his own national security apparatus to chase “kooky” theories about Ukraine pushed by lawyer Rudy Giuliani, resulting in “one hell of a Russian intelligence coup” that benefited Vladimir Putin at U.S. expense.

This was not simply a foreign policy dispute, Schiff argued, but a breach of long-held American values for Trump to leverage an ally — in this case Ukraine, a struggling democracy facing down Russian troops –î for the investigations he wanted ahead of 2020.

When the House started investigating his actions, Democrats said, Trump blatantly obstructed the probe. Even then-President Richard Nixon, they argued, better understood the need to comply with Congress in some of its oversight requests.

Drawing on historical figures, from the Founding Fathers to the late GOP Sen. John McCain and the fictional Atticus Finch, Schiff made his arguments emphatically personal.

“The next time, it just may be you,” he said, pointing at one senator after another. “Do you think for a moment that if he felt it was in his interest, he wouldn’t ask you to be investigated?”