The Republican senator said the Biden administration is "leading by coercion" after announcing the new vaccine requirements Wednesday.
"We are the strongest military on the face of this planet," the Iowa Republican senator said on Sunday.
The only other woman in elected GOP leadership defended Cheney in a recent interview.
President Joe Biden is facing pushback from some members of Congress who say they weren't briefed on his upcoming announcement that he'll remove U.S. troops from Afghanistan by a new September 11 deadline and have more questions about what will happen in the region.
Republicans and the NRA are opposed to a provision which would prevent any partner convicted of stalking or abuse from obtaining a firearm.
The GOP senator from Iowa received the COVID-19 vaccine on Sunday despite saying earlier she was "so skeptical" of the coronavirus mortality rate and suggesting health-care workers were faking the number of COVID deaths.
"To have that accusation offhandedly thrown out there just to confuse our voters across the United States, I think that is absolutely wrong," she added.
Eyes were on Iowa on Tuesday because the outcome of its Senate race could be the difference between Republican and Democrat control of the Senate.
Republican Senator Joni Ernst of Iowa has taken a slim lead over Democratic challenger Theresa Greenfield in a poll that showed her losing by 5 percent weeks earlier.
As Trump gave a shout out to Ernst and Fischer during his address in Nebraska, the camera showed both senators surrounded by people and not wearing masks.
Democrats need to gain at least four seats to take control of the Senate.
At least eight GOP incumbents are in danger of losing their seats, while just one Democrat looks likely to be ousted.
Ernst said that "it would be smart" for the Senate Judiciary Committee to be tested for COVID-19, but committee member Lindsey Graham says he doesn't need one because of a letter from his doctor.
Democrats need to gain at least four seats to take control of the upper chamber of Congress from the GOP.
Iowa Senator Joni Ernst sent out a fundraising campaign email detailing the Supreme Court vacancy shortly after the passing of Justice Ruth Bader Ginsburg was announced.
Democrats would need to win at least four Republican seats while maintaining all their current seats to take control of the upper chamber of Congress.
Obama said the people he was endorsing made him "optimistic" about the country's future long after November's election.
Democrats hope to flip at least four seats while maintaining all their current seats in order to take control of the Senate.
"It's bipartisan," Joni Ernst said. "Iowa launched Barack Obama a number of years ago."
Iowa Republican Senator Joni Ernst said her remarks about former Vice President Joe Biden being impeached for his dealings in Ukraine if he were to be elected were "taken entirely out of context."
"Joe Biden should be very careful what he's asking for," Senator Joni Ernst said.
"Maybe not the perfect call," Senator Joni Ernst said.
The Des Moines Register called for Sens. Chuck Grassley and Joni Ernst to back votes on witnesses and subpoenas in a Tuesday op-ed.
"The party was shaken by that," Scott Reed said. "We're all worried," he added.
Republican Senator Joni Ernst may not have heard President Donald Trump say he would not fire Conway for Hatch Act violations.
The trade deal requires approval of Congress, meaning Trump still needs to win over House Speaker Nancy Pelosi before the measure can pass—something tariffs with Mexico won't help. Now, even Republicans are expressing doubts.
"One in five jobs in Iowa is tied directly to trade," Senator Joni Ernst said. "Most of that is around the farming sector, our agricultural sector. So it is very tense times."
Iowa Senator Joni Ernst condemned King's comments on white supremacy as "offensive" and "racist."
Presidents get about $200,000 per year after they leave office, and unlimited work expenses. Many earn millions in speaking fees and book deals.