Elon Musk's super PAC is spending $2.1 million to support Republican candidates in swing districts across the U.S., which could help the world's richest man build a group of allies in Congress.

The committee's support could be key in determining whether Republicans can retain their majority in the House of Representatives after the November election. A new federal filing details the latest spending, the first major effort by the super PAC Musk founded earlier this year to influence elections beyond the presidential race.