Curtis wants an investigation into the alleged personal use of political ties.
Reactions started coming through shortly after the announcement on Sunday evening that President Joe Biden had pardoned his son, Hunter Biden, for his tax evasion and federal gun charges.
President Biden issued a pardon for Hunter Biden, saying his son was "selectively, and unfairly, prosecuted" because of politics in his gun and tax convictions.
Biden faces a maximum sentence of 17 years in prison and a fine of as much as $1.35 million.
Hunter Biden, 54, pleaded not guilty and says he belatedly paid all of his tax debts after regaining his sobriety in 2019, amid a lifelong struggle with alcoholism and drug abuse.
U.S. District Judge Mark Scarsi, in denying the motion, cited Hunter Biden's previous ill-fated efforts to dismiss the case.
