The Libertarian Party on Sunday nominated party activist Chase Oliver for president, rejecting former President Donald Trump and Robert F. Kennedy Jr. after they each spoke at the party’s convention.

Third parties have rarely been competitive in U.S. presidential elections and the Libertarian candidate four years ago won 1% of the vote. But the party’s decision is getting more attention this year due to the rematch between Trump and Democratic President Joe Biden, which could hinge again…