President Trump’s campaign moved swiftly to capitalize on a New York Post story suggesting then-Vice President Joe Biden met with a Ukrainian energy executive at the behest of his son, Hunter Biden.

The Trump campaign produced a television advertisement Wednesday titled “Hunter” that claims Joe Biden lied when he said in interviews with reporters that he and Hunter Biden never discussed his son’s business dealings. For more than a year, Trump and his allies have tried to undercut the Biden campaign with allegations of corruption on the part of the Democratic nominee, particularly related to the time Hunter Biden spent as a well-paid board member of the Ukrainian energy firm, Burisma.