Andrea Plunkett, formerly a field director for Sen. John McCainJohn Sidney McCainLawmakers worry about rise of fake video technology Democrats put Dreamers and their party in danger by playing hardball Trump set a good defense budget, but here is how to make it better MORE's (R-Ariz.) presidential campaign, also expressed her frustration with Akin's comments via Twitter.

"As an educated female Republican, I'd like to assure the world that Todd Akin is not representative of the whole of my party," she tweeted on Sunday night.

And Akin's former primary opponent, Sarah Steelman, tweeted early on Monday morning that "Todd Akin's remarks about 'legitimate rape' were inexcusable, insulting and embarrassing to the GOP."

The GOP lawmaker might have realized he was facing friendly fire at home, as he canceled a midday appearance on local conservative talk-show host Charlie Brennan's show. Brennan said that he didn't know specifically why Akin canceled, after having scheduled the interview on Friday to discuss his views on ending the federal school lunch program, but did suggest that maybe the congressman needed to "regroup."

"My opinion is that the longer he waits to try to put out this fire, the more damage he might suffer," Brennan said. He suggested Akin come out for a press conference or an interview on his show, because "he generally acquits himself very well when he is interviewed."

Akin did later come out for two interviews with prominent conservative talk-radio hosts: Mike Huckabee and Sean Hannity. He apologized during the interview with Huckabee, explaining that he meant "forcible" rather than "legitimate" rape and asserting that he understood the biological connection between rape and pregnancy.

But his response wasn't enough to prevent National Republican Senatorial Committee Chairman John CornynJohn CornynLawmakers feel pressure on guns Kasich’s campaign website tones down gun language after Florida shooting Murphy: Trump’s support for background check bill shows gun politics ‘shifting rapidly’ MORE (R-Texas) from pressuring him to drop out, according to sources familiar with a conversation between the two lawmakers in which Cornyn told Akin he'd be jeopardizing the GOP's chances at taking back the Senate this fall. The NRSC indicated to Akin that they would withdraw planned $5 million in expenditures from the race if Akin persisted.

But persist he did, tweeting out his intentions to stay in the race and going on Hannity's show to explain why.

"I still believe I'm in the strongest position to" win he said in the interview, in part due to the tough primary battle he fought for the nomination.

The first deadline for Akin to drop out is is Tuesday at 5 p.m., giving Akin just less than 24 hours to rethink his plans, but there's no indication yet that he'll defer to calls for resignation from top Republicans.