Other GOP candidate events on Friday include an afternoon book signing by Newt Gingrich at Washington's Union Station.
In Iowa, Ron Paul is conducting town hall meetings in Webster City in the morning and in Mason City and Waverly in the afternoon before attending an evening rally in Cedar Falls at the University of Northern Iowa.
Rick Santorum is hosting a town hall meeting in Cedar Falls and then speaking to students at the University of Northern Iowa before attending afternoon events in Newton and Des Moines.
Also campaigning in Des Moines is Michele Bachmann, who will host a town hall meeting Friday afternoon.
