Rewrite this sentence in the passive voice.

The former vice president, a longtime advocate of the priorities of traditional conservatives on social and economic issues, will join the race at a time when his onetime boss, former President Donald Trump, claims a majority in most national polls
The race will be joined by the former Vice President, a longtime advocate of the priorities of traditional conservatives on social and economic issues at a time when a majority in most national polls is claimed by his onetime boss, former President Donald Trump.