Rep. Todd Akin (R-Mo.) did not show up for his scheduled interview with Piers Morgan on his show Monday night, prompting Morgan to call him a "gutless little twerp."

His absence will certainly increase the speculation over when or whether the lawmaker will bow to mounting pressure to exit the U.S. Senate race in Missouri against incumbent Sen. Claire McCaskillClaire Conner McCaskillEx-CIA chief worries campaigns falling short on cybersecurity Ocasio-Cortez blasts NYT editor for suggesting Tlaib, Omar aren't representative of Midwest Trump nominees meet fiercest opposition from Warren, Sanders, Gillibrand MORE (D).

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Akin was scheduled to appear on the show after comments he made, that in the case of "legitimate rape" women don't get pregnant because of biological mechanisms that prevent such an outcome, caught fire nationwide. His comments broke on Sunday but prompted outrage from Republicans at all levels through Monday afternoon, along with mounting calls for his exit from the race. National Republican Senatorial Committee Chairman John CornynJohn CornynThe Hill's Morning Report - Trump hews to NRA on guns and eyes lower taxes The Hill's Morning Report - Trump on defense over economic jitters Democrats keen to take on Cornyn despite formidable challenges MORE (Texas) indicated in a conversation with Akin that, were the congressman to remain in the race, the NRSC would pull a planned $5 million investment in the state.

But Akin persisted, tweeting out his plans to remain the Republican nominee for Senate in Missouri and going on Sean Hannity's radio show to reaffirm his commitment. His appearance on Morgan's show was expected to shed further light on his decision, or perhaps offer a national platform for a withdrawal.