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 McCaskillDemocratic Homeland Security members request additional DHS nominee testimony Senate panel delays vote on Trump’s Homeland Security pick Steve Israel: ‘We had a better time at the DMZ than we’re going to have tonight’ 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 CornynAfter Texas shooting, lawmakers question whether military has systemic reporting problem Overnight Defense: Lawmakers question military's lapse after Texas shooting | Trump asks North Korea to 'make a deal' | Senate panel approves Army pick Overnight Regulation: House passes bill to overturn joint-employer rule | Trump officials to allow work requirements for Medicaid | Lawmakers 'alarmed' by EPA's science board changes 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.