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

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

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

The White House hosted a somewhat unexpected visitor on Monday: billionaire entrepreneur Mark Cuban.

Donald Trump expanded TrumpRx with 600 generic drugs as Mark Cuban backed the push to lower prescription costs.

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."