Donald Trump has appointed Charles Kushner, his son-in-law’s father, to be the US ambassador to France.

The president-elect, 78, pardoned Kushner, who in 2006 served a prison sentence for tax evasion, witness tampering and making illegal campaign donations, at the end of his first administration.

Chris Christie, a former New Jersey governor, described Kushner’s case as “one of the most loathsome, disgusting crimes” he ever prosecuted as a US attorney.

Announcing Kushner’s appointment, Trump said the property developer, 70, was a “tremendous business leader, philanthropist and dealmaker, who will be a strong advocate representing our country and its interests”.

He referenced Kushner’s son, Jared, Trump’s former White House adviser, but did not mention that he is married to his daughter Ivanka.

“Congratulations to Charlie, his wonderful wife Seryl, their four children, and 14 grandchildren,” Trump wrote on Truth Social.

He added: “His son, Jared, worked closely with me in the White House, in particular on Operation Warp Speed, Criminal Justice Reform and the Abraham Accords.

“Together, we will strengthen America’s partnership with France, our oldest ally, and one of our greatest!”