Rep. Steve King (R-Iowa) is wondering if Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE will be on medication during Monday night’s presidential debate against Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE.

Tonight's biggest post #debate question: Inquiring American minds will want to know,

was Hillary on her meds or off her meds? — Steve King (@SteveKingIA) September 26, 2016

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The conservative lawmaker previously backed Sen. Ted Cruz Rafael (Ted) Edward CruzThe Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy Murkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight MORE (R-Texas) in the GOP presidential primaries before ultimately endorsing Trump, the party's presidential nominee. His tweet comes hours before Clinton, the Democratic nominee, and Trump clash at Hofstra University in Hempstead, N.Y., in the first of three contests.

Monday’s hotly anticipated encounter is expected to shatter past debate viewership records, with experts predicting an audience of more than 100 million people.

The event is critical for both Clinton and Trump as recent polls show a tightening White House race at both the state and national levels.

Clinton leads Trump by about 2 points nationwide, according to the latest RealClearPolitics average of polls.

Trump has repeatedly accused Clinton of lacking the physical stamina for the Oval Office.

Her health became a campaign issue earlier this month when Clinton nearly collapsed following a 9/11 memorial ceremony.

Clinton’s doctor then announced the Democratic presidential nominee had been diagnosed with pneumonia two days before the incident.

Trump’s surrogates have floated several conspiracy theories concerning Clinton’s overall mental and physical health.

Spokeswoman Katrina Pierson, for example, claimed last month that Clinton suffers from a disorder caused by brain damage that impairs her communication.