Osborn said he would take on Sen. Pete Ricketts (R-Nebraska) as an independent in a race that has already gotten President Donald Trump’s attention.

Former labor union leader and independent candidate Dan Osborn has announced his bid for a Nebraska U.S. Senate seat, challenging Republican Sen. Pete Ricketts

Independent populist Dan Osborn, whose insurgent Senate campaign seriously threatened one of Nebraska’s Republicans from securing a third term last year, is now taking on GOP Sen. Pete Ricketts — one of the wealthiest members of Congress.