Milwaukee, July 15 (RHC)-- About 50,000 Republicans are descending on the shores of Lake Michigan for the four-day event meant to fire up the grassroots in support of Trump’s formal nomination as the U.S. presidential hopeful.

The Milwaukee convention is very much a family affair, with Lara Trump and the former president’s two eldest sons, Don Jr and Eric, due to take the podium.

Former first lady Melania Trump is also set to make a rare appearance but is not scheduled to speak.

Many other high-profile Republicans are slated to address the delegates, including several of the frontrunners in the contest to be Trump’s running mate.

The ex-president appears to have zeroed in on two U.S. senators – JD Vance of Ohio and Marco Rubio of Florida – as well as North Dakota Governor Doug Burgum, who initially ran against Trump for the nomination before falling in line.

All have speaking roles, although Vance seems to have the momentum, and is a marginal favorite among Washington watchers.