Former President Donald Trump is challenging Joe Biden to debate. But he is also receiving calls to debate from his remaining primary opponent. Biden is laughing off Trump’s latest challenge. The exchange of jabs is putting into question whether any of them will face off in a debate this year. Biden’s reelection campaign has declined to commit to joining debates with Trump, his likely opponent in the November general election. Trump has previously objected to the rules of the nonpartisan commission that has hosted general election debates since 1976 and skipped all of the primary debates so far.