A group of seven first-term House Democrats on Monday penned a joint op-ed urging Congress to use all of its powers to determine whether new allegations regarding 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's interactions with the leader of Ukraine are true.

The lawmakers, who hail from competitive swing districts and who have experience in national security, wrote in The Washington Post that Trump should be impeached if allegations that he withheld military aid to Ukraine as part of an attempt to get the country to investigate the son of 2020 presidential candidate 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 are true.

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"If these allegations are true, we believe these actions represent an impeachable offense. We do not arrive at this conclusion lightly, and we call on our colleagues in Congress to consider the use of all congressional authorities available to us, including the power of 'inherent contempt' and impeachment hearings, to address these new allegations, find the truth and protect our national security," the congressman write.

The op-ed was authored by Democratic Reps. Gil Cisneros Gilbert (Gil) Ray CisnerosMORE (Calif.), Jason CrowJason CrowClark rolls out endorsements in assistant Speaker race Trump-Afghan deal passes key deadline, but peace elusive Cook shifts 20 House districts toward Democrats MORE (Colo.) Chrissy Houlahan (Pa.), Elaine Luria Elaine Goodman LuriaKate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House Congress must finish work on popular conservation bill before time runs out Virginians wait up to four hours to cast early voting ballots MORE (Va.), Mikie Sherrill Rebecca (Mikie) Michelle SherrillHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll House passes legislation to boost election security research Lawmakers call for bipartisan push to support scientific research MORE (N.J.), Elissa Slotkin Elissa SlotkinWray: Racially motivated violent extremism makes up most of FBI's domestic terrorism cases Overnight Defense: House chair announces contempt proceeding against Pompeo | Top general says military has no role in election disputes | Appeal court rejects due process rights for Gitmo detainees Top general: Military will play no role in resolving any electoral dispute MORE (Mich.) and Abigail Spanberger Abigail Davis SpanbergerVulnerable Democrats tell Pelosi COVID-19 compromise 'essential' Trump asked Chamber of Commerce to reconsider Democratic endorsements: report Virginians wait up to four hours to cast early voting ballots MORE (Va.).

Trump is facing mounting scrutiny over reports that he pressured Ukrainian President Volodymyr Zelensky in a July phone call to investigate Biden and his son, Hunter Biden.

The call occurred around the same time the Trump administration moved to freeze $250 million in military aid to Ukraine, raising speculation from some lawmakers about whether the president used the aid as leverage in the talks. The president earlier this month released the aid after lawmakers raised concerns.

"He allegedly sought to use the very security assistance dollars appropriated by Congress to create stability in the world, to help root out corruption and to protect our national security interests, for his own personal gain," the lawmakers wrote. "These allegations are stunning, both in the national security threat they pose and the potential corruption they represent."

The congressional Democrats decried Trump's actions as a "flagrant disregard for the law," adding that they "cannot stand."

Trump on Monday denied discussing military aid with Zelensky during his talks with the Ukrainian leader, telling reporters at the United Nations General Assembly that he "did not make a statement that you have to do this or I’m not going to give you aid."

The latest allegations against Trump have led to renewed calls from many Democrats to launch impeachment proceedings against the president. House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.) said Sunday that impeachment "may be the only remedy" if the reports that Trump pressured Ukraine for info on a political opponent are true.

Freshman Minnesota Reps. Dean Phillips (D) and Angie Craig (D), both of whom defeated Republican incumbents last year, on Monday raised calls for impeachment following reports of Trump's talks with Ukraine.