U.S. Sen. Kirsten Gillibrand on Friday told reporters that firing White House special counsel Robert Mueller would risk a “constitutional crisis” and his investigation into Russian collusion should proceed without White House intervention.

Gillibrand, at an unrelated event in Syracuse, was responding the news that Trump last year had sought to fire Mueller, but relented after the president’s top counsel threatened to quit.

“I believe that is a line he should not cross,” she said. “I think it risks a constitutional crisis. It should not have interference from the White House.”

Meanwhile, Gillibrand also said congressional Democrats should push back strongly in favor of legal protections for undocumented immigrants who arrived in the United States as children, known as dreamers.

Another funding showdown is approaching next month after a brief federal government shutdown in part over the Deferred Action For Childhood Arrivals was resolved this week.

“From the outside it certainly looks like Washington’s broken and cannot come together to meet the needs of people,” she said. “If we cannot protect the DACA kids, I hope we fight as hard as we possibly can. These are hundreds of thousands of people here who are doing good things for our country.”

She added the Trump-backed proposal for DACA of what she has seen “looks inadequate to me.”