 On April 9, 2007, the show debuted as one of a series of rotating programs auditioning for Imus's former slot, with Scarborough joined by co-hosts Mika Brzezinski and Ridley.Scarborough had personally asked Brzezinski to co-host with him the night before the first audition, while she was a "cut-in" presenter during MSNBC's primetime schedule on a freelance basis.Ridley quickly dropped out as main co-host but continued as a regular guest, while Willie Geist was tapped as co-host.