Biden scoffs at Trump's attacks

Former Vice President Joe BidenJoe BidenSunday shows preview: Coronavirus dominates as country struggles with delta variant Did President Biden institute a vaccine mandate for only half the nation's teachers? Democrats lean into vaccine mandates ahead of midterms MORE on Wednesday jokingly addressed the barrage of Twitter attacks President TrumpDonald TrumpKinzinger says Trump 'winning' because so many Republicans 'have remained silent' Our remote warfare counterterrorism strategy is more risk than reward Far-right rally draws small crowd, large police presence at Capitol MORE aimed at him earlier in the day.

"I understand the president has been tweeting about me this morning," Biden said at a campaign event in Iowa, followed by a laugh. "I wonder why the hell he’s doing that."

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Trump in an early morning Twitter spree retweeted nearly 60 posts, most of which knocked Biden and his 2020 presidential campaign.

Trump "welcomed" Biden to the campaign trail last week, calling him "Sleepy Joe" in a post on Twitter.

Trump has reportedly rebuffed advice to ignore Biden from his political advisers, who worry the president risks elevating the former vice president's profile, according to CNN.

Biden has shown a penchant for firing back at Trump, saying in a tweet earlier this week that he is "sick of this president badmouthing unions."

Biden is leading the Democratic field in several early polls.