WASHINGTON (AP) -- Veterans Affairs Secretary Robert McDonald said Tuesday he regrets remarks he made comparing long wait times at VA health care sites to waiting in line at a Disney amusement park. "It was never my intention to suggest that I don't take our mission of serving veterans very seriously," McDonald said in a written statement. "If my comments Monday led any veterans to believe that I, or the dedicated workforce I am privileged to lead, don't take that noble mission seriously, I deeply regret that. Nothing could be further from the truth." McDonald's statement came after a Republican senator called for his resignation and GOP lawmakers and veterans' service groups slammed his remarks as insulting and inappropriate. Sen. Roy Blunt, R-Mo., said McDonald's "preposterous statement is right out of Never Never Land" and said the VA leader has shown he cannot ensure that veterans receive health care in a timely manner "Dismissing wait times when veterans can often wait months for an appointment is negligent and a clear sign that new leadership is needed at the VA," Blunt said as he called for McDonald to step down. McDonald said at a breakfast Monday that the VA should not use wait times as a measure of success, comparing waits for VA health care to the hours people wait for rides at Disney theme parks. McDonald said a veterans' health-care experience was more important than the time spend waiting for an appointment. House Speaker Paul Ryan, R-Wis., called McDonald's comments "disgusting and beyond the pale," although he stopped short of calling for him to step down. "This is not make-believe. This is not Disneyland, or Wonderland, for that matter," Ryan told reporters. "Veterans have died waiting in line for their care." Republicans said McDonald's comments were especially egregious since he took office in 2014 after his predecessor was forced out amid a scandal over chronically long wait times at VA health care sites and reports that as many as 40 patients died while awaiting care at the Phoenix VA hospital. Similar problems were discovered at VA health sites nationwide, along with a widespread practice among VA employees of creating secret lists to cover up the long wait times and receive VA bonuses. Rep. Cathy McMorris Rodgers of Washington state, a member of the Republican leadership, said McDonald's comments were hard to believe. "When you go to Disneyland, you aren't wondering if you are going to live long enough to make it to Space Mountain," she said. Democrats called Blunt's comment a blatant bid to boost his re-election chances. "Senator Blunt of all people should know another resignation at the VA will likely only make things worse," said Missouri Secretary of State Jason Kander, Blunt's likely Democratic challenger. Senate Democratic Leader Harry Reid of Nevada, who is known for his own verbal miscues, supported McDonald. Referring to himself as "an expert at wrong choice of words," Reid said McDonald "could have done a better job talking about Disneyland, but he didn't. He is a good man, he's doing his best under very, very difficult circumstances. So I support Secretary McDonald all the way."