ST. PAUL — The chief of Minnesota’s health insurance marketplace resigned Tuesday after facing criticism over the troubled rollout and a questionably timed international vacation.

April Todd-Malmlov submitted her resignation during an emergency closed session of the government board ofMNsure, Minnesota’s version of the insurance exchange that’s tied to the federal health care overhaul. She had been under increasing pressure over insurance sign-up problems and failed to get a vote of confidence from Democratic Gov. Mark Dayton last week.

Scott Leitz, an assistant commissioner at the state Department of Human Services with more than a decade of high-level health care experience, was named interim chief executive while a search for a permanent leader is conducted.

“MNsure must do better. If there are problems or mistakes, we will acknowledge and fix them,” Leitz said in a statement released by the agency. He was to hold a news conference Wednesday.

Dayton said he fully supports the switch and has faith in Leitz’s abilities.

“The recent problems some have experienced with MNsure are completely unacceptable. I am hopeful that this new leadership will lead to their swift resolution,” he said in a written statement.

Todd-Malmlov, 36, was not made available for comment. She was a key figure in Minnesota’s adaptation to the federal health overhaul since 2011. The exchange is meant to show people what options they have to buy subsidized health insurance. But after the Oct. 1 enrollment launch, MNsure’s website encountered technical issues and a backup call center didn’t fare much better.