In the four months since Joe Biden effectively won the Democratic presidential nomination, he has focused on consolidating the party’s divergent and often warring factions. As the closing stretch of the campaign nears, that effort will expand to include Republicans disaffected with President Donald Trump.

Former Ohio Gov. John Kasich, a Republican and frequent Trump critic, has been approached and is expected to speak at the Democratic National Convention on Biden’s behalf next month, according to a person with direct knowledge of the plans who insisted on anonymity to discuss strategy. Kasich is among a handful of high-profile Republicans likely to become more active in supporting Biden in the fall.

Trump, meanwhile, is doing virtually nothing to expand his appeal beyond his most loyal supporters. Some GOP operatives believe the suburbs are lost while a contingent of high-profile Republicans are openly questioning the president’s reelection message. In an acknowledgment of the mounting challenges, Trump named a new campaign manager last week.