DAVENPORT, Iowa — As Republican front-runner Donald Trump wrapped up a whirlwind week of campaigning — one that included six rallies in five states, a forum, a book signing, media interviews and lots of tweeting — he accused Hillary Clinton of not being able to keep up with him.

Trump has repeatedly said this week that Clinton will attend a campaign event or do a heavily negotiated media interview, then disappear for several days — he says to sleep, something that he only does for a few hours each night.

"You don't see her for four or five days, then four or five days later, she awakens, puts on her pantsuit, goes out and does a, you know, does a press conference," Trump said at a rally in this eastern Iowa town on Saturday afternoon, his second rally in the state that day. "She throws on the 'ol pantsuit."

Trump has repeatedly said Clinton is "exhausted" and lacks "the strength or the stamina" for the presidency — comments that have prompted Clinton supporters to point out that the former secretary of state recently endured an 11-hour-long congressional hearing on the Benghazi attacks, while Trump has complained about a GOP debate that lasted three hours. Clinton's campaign schedule contains many more events than Trump claims, although the Democratic front-runner is not in front of cameras nearly as much as him. No presidential candidate is.

Trump appeared to take a little time off for Thanksgiving last week, then held a rally in Florida on the Saturday after the holiday. On Sunday, he appeared on "Meet the Press." Then came more rallies: Georgia on Monday, New Hampshire on Tuesday and Virginia on Wednesday. On Thursday, he spoke at a forum in Washington, D.C., and then did an hour-long book signing that was broadcast online. Friday brought a rally in North Carolina. On Saturday, Trump did two rallies on opposite ends of Iowa, a feat only possible with his private jet.

Trump and Clinton are nearly the same age: He is 69, she is 68. The oldest president to date was Ronald Reagan, who was nearly 70 when he took office, and most presidents start the job in their 50s. Still, Trump has presented himself as an invincible super-human whose health is "perfection." He brags that he doesn't drink or smoke, sleeps only a few hours per night and is the father of a 9-year-old son.

But in Iowa on Saturday, Trump showed symptoms of being, perhaps, human. His voice was hoarse, and he told reporters at his first stop in northwest Iowa that he had "a little laryngitis."

That didn't stop him from repeatedly cursing, launching colorful attacks against his rivals and promising to build a "artistically beautiful" wall along the southern border that would be "one foot higher" than the iconic Great Wall in China. Trump also energetically called for Americans to have increased access to guns following the recent mass shooting in California and again cast suspicion on the relatives of those shooters, saying they should face "a big, big price."

Trump has used that shooting — along with the recent terrorist attacks in Paris and the 9/11 attacks — as reasons that the United States needs to be highly skeptical of all Muslims. He has promised to not allow political correctness to get in the way of aggressively protecting the country.

"I'll tell you what, folks: We're going to be so vigilant. We're going to be so careful. We're going to be so tough and so mean and so nasty," Trump said to loud cheers at an afternoon rally in Davenport. "That s--t is not going to happen any more, I'll tell you. Not going to happen any more."

Trump also suggested that Sgt. Bowe Bergdahl — who deserted his post in Afghanistan in 2009, was captured and held hostage for years before being rescued — should be dumped from a plane in the middle of Afghanistan. At previous rallies, Trump has suggested that Bergdahl be shot for being a traitor.

"Should we give him a parachute or not? I say no. No, don't give him a parachute," Trump said at a rally in Spencer, Iowa, on Saturday morning. "Why would we want to waste a parachute?"

And with fewer than two months until the Feb. 1 caucuses, Trump also urged those in his crowds at both rallies to vote.

"You've got to get to the caucus," Trump said at the rally in Spencer. "You've got to get there... even if you're not feeling good, if you're feeling horrible, if you had a horrible fight with your wife or your husband -- could happen. If you caught your husband cheating the night before, you've got to go to the caucus. Right? Right?"