The Minnesota congressman who unsuccessfully challenged Joe Biden in the Democratic presidential primary has become the first member of their party to call on fellow US House representative Henry Cuellar to resign after federal bribery charges were unveiled against the Texas politician on Friday. In a post on X, Dean Phillips urged Cuellar to step down, along with other politicians faced with pending criminal cases – including Biden’s presidential predecessor and Republican rival Donald Trump as well as Democratic US senator Bob Menendez. “While the bar for federal indictment is high, trust in our government is low,” Phillips’ post on X said.

“That’s why office holders and candidates under indictment should resign or end their campaigns, including [senator] Bob Menendez, Donald Trump & [congressman] Henry Cuellar.” The remarks from Phillips came after federal prosecutors alleged on Friday that Cuellar and his wife, Imelda Cuellar, accepted about $600,000 in bribes in exchange for influencing policy in favor of Azerbaijan as well as a Mexican bank between December 2014 and November 2021. Imelda Cuellar used “sham consulting contracts”, front companies and intermediaries to launder the money, prosecutors alleged.

And in return for the bribes, Henry Cuellar – who has represented a swath of Texas’s border with Mexico in Congress since 2005 – allegedly steered US foreign policy to Azerbaijan’s advantage while pressuring unnamed “high-ranking” federal government executives to implement measures benefiting the bank. In a statement, Henry Cuellar maintained his and his wife’s innocence. “I want to be clear that both my wife and I are innocent of these allegations,” the congressman’s statement said. “Everything I have done in Congress has been to serve the people of south Texas.”

Friday’s announcement from prosecutors prompted the House Democratic minority leader, Hakeem Jeffries, to say that Cuellar would step down as the ranking member of a homeland security subcommittee while the case against him proceeded. Jeffries cited the party’s rules in the House.

However, Jeffries made it a point to describe Cuellar as “a valued member of the House Democratic caucus” who was “entitled to his day in court and the presumption of innocence throughout the legal process”. Phillips did not concur, in his estimation lumping in Cuellar with Menendez and Trump as politicians who did not deserve to hold elected office as they grappled with criminal charges. Menendez has pleaded not guilty to federal corruption charges – he has said he doesn’t plan to run for re-election as a Democrat but hasn’t ruled out an independent candidacy.

Trump has pleaded not guilty to nearly 90 felonies for trying to subvert the results of the 2020 election that he lost to Biden, improper retention of classified materials after his presidency and hush-money payments to an adult film actor that prosecutors allege were improperly covered up. The former president’s trial centering on the hush money concluded its third week on Friday. He is the Republican party’s presumptive nominee for November’s presidential race. One indicted politician who recently did not leave his position on his own terms was George Santos, who was expelled from the US House amid fraud-related charges.

Phillips mounted a long-shot bid to deny Biden from winning a second consecutive Democratic nomination seemingly against the advice of most of his party colleagues. Biden dominated the contest, and Phillips dropped out after losing his home state. His cause was not helped when a political operative working for the Phillips campaign – without permission from the candidate or his advisers – admitted being behind a artificial intelligence-created robocall that spoofed Biden’s voice on the eve of the primary’s start and urged Democrats in New Hampshire to avoid voting.

Phillips was first elected to Congress to represent a wealthier suburban area outside Minneapolis in 2019 but gave up seeking re-election to his seat in November to pursue his challenge to Biden.