House Democrats grilled Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) about his party loyalty and his timeline for endorsing presumptive presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE during a meeting Wednesday morning.

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Sanders refused to offer a timeline for when he’ll endorse Clinton, despite questions from lawmakers — most of whom backed the former secretary of State early in the primary race.

While Sanders began the session with remarks resembling a typical stump speech, the session at times turned tense as lawmakers questioned his commitment to the Democratic Party, given that he has always identified as an independent.

Politico reported that Democrats booed when Sanders said his goal is to “transform America” instead of win elections.

Rep. Gerry Connolly Gerald (Gerry) Edward ConnollyJudge issues nationwide injunction against Postal Service changes House panel advances bill to ban Postal Service leaders from holding political positions Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (D-Va.), however, disputed the Politico report. "Expressions of disagreement are NOT booing," he tweeted

.@politico story is false. Bernie was respectfully received by Caucus. Some disagreements, yes, but a friendly venue — Gerry Connolly (@GerryConnolly) July 6, 2016

Sanders was reflective and thoughtful in responses. Expressions of disagreement are NOT booing — Gerry Connolly (@GerryConnolly) July 6, 2016

Sanders was also asked about whether he’d be willing to reform caucuses in the same way he’s been pushing to overhaul the superdelegate system in future Democratic presidential primaries. Sanders has called for more open primaries, but hasn’t taken a similar position on caucuses, in which he frequently performed better during the contest against Clinton.

“There were some candid conversations. He was asked about his commitment to the party, he was asked about, you want to go after superdelegates, what about caucuses?” said Connolly. “He acknowledged that caucuses can be a problem. But he also talked about firehouse caucuses, which can maybe bridge that gap.”

“He took a little bit of heat and did it with grace,” Connolly said.

However, Democrats viewed Sanders’s coordination on Wednesday with Clinton’s campaign in support of his debt-free college tuition plan as a good first step toward party unity ahead of the party's national convention in Philadelphia later this month.

“I think Sen. Sanders has brought a lot of energy to this campaign and Sen. Sanders has earned a way forward to bring his supporters together. And I think that’s the timeline he’s working on,” said Rep. Ben Ray Luján (D-N.M.), who chairs the House Democrats’ campaign arm.

“Today is evidence that Sen. Sanders and Secretary Clinton are working together,” Luján said.

--This report was updated at 1:01 p.m.