They can’t quite top Bernie Sanders, but Hawaii U.S. Sens. Brian Schatz and Mazie Hirono both rank among the three most popular senators in the nation, according to a recent poll by survey research company Morning Consult.

Schatz received a 69 percent approval rating from Hawaii voters, making him the second most popular senator after former presidential candidate and independent U.S. Sen. Sanders of Vermont, according to the poll. Sanders had a 75 percent approval rating among voters in his home state.

Hirono was close behind Schatz with a 67 percent approval rating in Hawaii, and has increased her popularity by 11 percentage points since similar polling was done before the 2016 election. That was the largest approval-rating increase of any senator.

Those rankings of U.S. senators were based on 141,400 interviews with registered voters across the country that were conducted from April 1 through June 18, according to Morning Consult. The poll results were released publicly July 11.

Colin Moore, director of the Public Policy Center at the University of Hawaii at Manoa, said he’s a bit surprised at the numbers and thinks the Hawaii senators’ popularity is getting a boost from many Hawaii voters’ intense dislike for President Donald Trump. The senators’ popularity is “not necessarily due to something they’ve done,” he said.

“Most of this is just driven by pure partisanship and party ID,” Moore said. “Hawaii is always one of the highest states for people who identify as Democrats, and that’s reflected in the approval of their senators, and this of course is driven by Democrats’ hatred of Donald Trump.”

The senators in the heavily Democratic state of Vermont — both Sanders and U.S. Sen. Patrick Leahy — likely benefited from a similar pattern, Moore said. Leahy ranked as the fifth most popular senator in the nation with a 66 percent approval rating, according to the poll.

Hirono and Schatz have been vocal critics of various Trump administration actions such as his executive orders on immigration, his proposed budget and his efforts to repeal and replace the Affordable Care Act, or Obamacare.

Another factor that may have contributed to Hirono’s surge in popularity is voters’ sympathy during her recent illness, Moore said. Hirono’s had successful surgery June 27 to remove part of a rib.

That operation was the second of two surgeries planned since Hirono, 69, was diagnosed with stage 4 kidney cancer earlier this year. In May, Hirono had one of her kidneys removed, and the two operations were expected to remove all traces of cancer.