Democratic presidential candidate Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE on Sunday called out 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 as a "walking conflict of interest."

The South Bend, Ind. mayor told Jake Tapper Jacob (Jake) Paul TapperThe media's misleading use of COVID-19 data Julia Louis-Dreyfus: 'We can't spend much time grieving' Ginsburg Pence aide dismisses concerns rushed vote on Trump nominee will hurt vulnerable senators MORE on CNN's "State of the Union" that news that 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's son, Hunter, has stepped down from the board of a Chinese firm and is vowing to do no foreign work if his father is elected president in 2020 shows a "difference in standards" between the Bidens and Trump's family.

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"Here you have Hunter Biden stepping down from a position in order to make sure even though there's been no accusation of wrongdoing, doing something just to make sure there's not even the appearance of conflict of interest," Buttigieg said.

"While in the White House, the president of the United States is a walking conflict of interest," he added.

He claimed the president's relatives use Trump's presidency to benefit their interactions with foreign governments and that his sons, in particular, pretend "the fact that their father is the president of the United States has no impact on the international business dealings that they do."

"It is a radically different standard, and we cannot allow this president to change the subject especially with unfounded allegations," he said.