Trump seemed to relish winning the support of his one-time foe, turning to Cuban and saying, "Well, he made a mistake. It was a big mistake."

Cuban, a former Kamala Harris supporter, appeared with Trump after announcing the partnership.

The Trump administration is adding generic medications to TrumpRx.gov. Billionaire Mark Cuban is set to attend the White House event.

Billionaire Mark Cuban, who owns and operates the online generic pharmaceutical marketplace Cost Plus Drugs, is expected to attend the event.

TrumpRx will expand its portfolio by adding more than 600 generic medications to the discount drug platform.