Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.), a Democratic presidential candidate, on Tuesday tweeted out a petition asking supporters to sign up if they want to see impeachment proceedings begin against President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE.

The petition link directs to Harris's campaign website, and signatories who give their cellphone numbers will receive updates from Harris's presidential campaign. Those who add their names are also encouraged to donate to her campaign.

"As a 2016 candidate, Donald Trump openly encouraged a foreign adversary to hack a political opponent and attack our elections. As President, he's doing it again in broad daylight. We cannot stand for this abuse of power," the petition webpage said. "Donald Trump is not above the law. Add your name to demand the House begin proceedings to impeach Trump."

Trump openly encouraged a foreign adversary to hack a political opponent and attack our elections.



He’s doing it again.



Add your name to demand the House begin proceedings to impeach Trump»https://t.co/g6aouA7Zu2 — Kamala Harris (@KamalaHarris) September 24, 2019

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The petition comes as House Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) plans to launch a formal impeachment inquiry against Trump.

An increasing number of House Democrats have come out in favor of impeachment proceedings following reports that Trump pressed Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his son Hunter Biden.

The petition also follows reports that Trump withheld military aid from Ukraine ahead of the call.

Trump has said that he discussed Joe Biden during the call but denied that he pushed for an investigation into the presidential candidate. He has also said that he held up the aid because he wanted other countries to provide more assistance to Kiev's defense spending.

Other Democratic presidential candidates including Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) have also called for impeachment.

“After the Mueller report, Congress had a duty to begin impeachment. By failing to act, Congress is complicit in Trump’s latest attempt to solicit foreign interference to aid him in U.S. elections,” Warren tweeted last week. “Do your constitutional duty and impeach the president.”

Harris is among more than a dozen people running for the 2020 Democratic presidential nomination.