WASHINGTON — For the Republican Party, the presidential candidates keep coming.

The next wave arrives this week, with Carly Fiorina announcing her long-shot bid for the Republican nomination Monday morning and former Gov. Mike Huckabee of Arkansas set to announce his own on Tuesday. Ben Carson announced his bid on Sunday night. They will join Senators Ted Cruz, Marco Rubio and Rand Paul in the race.

Ms. Fiorina started things off low-key on Monday with an announcement, which is to be followed by a call with reporters and a virtual town-hall-style meeting. Later in the week, she will head to Iowa, New Hampshire and South Carolina.