While final nominees will be known only when Mr Trump makes the announcement, this would be for the second time that Mr Thapar might not be able to make it to the final cut after being interviewed by Trump. He's reportedly down to four possible picks, all of whom are Federalist Society members: Brett Kavanaugh, Amy Coney Barrett, Raymond Kethledge and Thomas Hardiman.
Her socially conservative views and affiliation with People of Praise, a tight-knit religious lay group, are already attracting suspicion.
"Am I optimistic that [Trump is] going to nominate somebody that I would feel comfortable about?" said McCaskill.
NBC, which only has American Ninja Warrior's Minneapolis qualifiers booked for this Monday, has yet to announce any tweaks to its line-up, while Fox as has been the case this summer has a disposable 9-1-1 rerun airing at 9 pm.
Battle lines have been drawn over the future of abortion in America on the eve of President Trump's nomination of a second justice to the U.S. supreme court that could put the landmark 1973 ruling Roe v Wade in jeopardy. I do think the president has to think about who is the easiest to get confirmed here.
"It is extraordinary", Blumenthal said.
Savoring the suspense, Trump has sought to keep people guessing in the final hours, hoping to replicate his successful announcement of Justice Neil Gorsuch a year ago. On Sunday there was no indication that he had yet made his decision, as speculation continued to swirl around the appointment. Richard Blumenthal, Democratic senator from CT, told ABC's This Week that it posed a fundamental threat to abortion rights. He said Kavanaugh's seat on the appellate court could help him, because he sees a lot of issues that Trump cares about.
"This next nomination will be the swing vote to overturn Roe v Wade and equally important to eviscerate the protections of millions of Americans who suffer from existing conditions and other healthcare rights along with workers' rights, gay rights, voting rights".