MUSCATINE, Iowa ― Sen. Bernie Sanders (I-Vt.), who is running for the Democratic nomination for president in 2020, said on Saturday that while he believes the filibuster process needs some reform, he doesn’t want to get rid of it. And people who do should be wary.

“Donald Trump supports the ending of the filibuster. So you should be a little bit nervous if Donald Trump supports it,” he told HuffPost in a sit-down interview before a town hall.

Getting rid of the filibuster ― which requires most significant legislation to get 60 votes, rather than just a majority, for passage ― has been bubbling up as a big issue on the 2020 campaign trail.

Last week, Sen. Elizabeth Warren (D-Mass.) issued the most high-profile call to get rid of it. Pointing to Senate Majority Leader Mitch McConnell’s (R-Ky.) blockade and slow-walk of many of President Barack Obama’s judicial nominees, Warren said, “When Democrats have the White House again, if Mitch McConnell tries to do what he did to President Obama, and puts small-minded partisanship ahead of solving the massive problems facing this country, then we should get rid of the filibuster.”

In February, Sanders also said he wasn’t “crazy” about getting rid of the filibuster, and indeed, Trump has repeatedly told Republicans that they should dump it.