The Minnesota Democrat said she caught her cancer early and encouraged people not to put off routine medical exams.
"If this decision doesn't cry out for that, I don't know what does," the Democratic senator said after the conservative Supreme Court allowed the law to go into effect.
Democrats have renewed their efforts to muscle through the largest overhaul of U.S. elections in a generation.
"States are not engaging in trying to suppress voters whatsoever," Sen. Mitch McConnell said at the first hearing on the For The People Act.
Sen. Amy Klobuchar (D-Minn.) and Rep. Debbie Dingell (D-Mich.) introduced the Protecting Domestic Violence and Stalking Victims Act on Tuesday morning.
Democrats, asserting constitutional authority to set the time, place and manner of federal elections, want national rules they say would make voting more fair.
"This is embarrassing," the Democratic senator from Minnesota said.
Just hours after learning his life sentence had been commuted, he walked out the front door of Stillwater prison.
Her confirmation seems inevitable, as even some Senate Democrats acknowledged.
Amy Coney Barrett's confirmation would move the nation dramatically right for a generation and "harm millions of Americans," said VP candidate Sen. Kamala Harris.