A top supporter of Hillary Clinton hesitated to say whether the Democratic presidential hopeful will win battleground states like Minnesota and Michigan, where Donald Trump plans to campaign on Sunday.

"I'm not a pundit," Sen. Al Franken, D-Minn., told CNN's Jake Tapper on Sunday when asked if Clinton pull off a victory in Michigan next Tuesday. The former secretary of state has seen polls tighten in the Great Lake State and will send President Obama to campaign there on the eve of the election.

Franken was also asked if his home state of Minnesota, a traditionally blue state where Clinton carries a 4-point lead, will instead go for the Republican nominee on Nov. 8.

"I don't think so," he said, noting that it is likely to be a close contest.

"I'm always nervous," Franken told Tapper. "I was nervous in '12. I was nervous in '08. I go to canvassing centers [and] I say many of you have jobs, many of you have families – ignore them. Get on the doors."

Soon after Franken's interview concluded, Trump campaign manager Kellyanne Conway told Tapper the Democratic senator seemed concerned about Clinton's prospects next Tuesday.

"He sounded very worried, by the way," Conway said.