More than 500 people who worked on US President Joe Biden’s 2020 election campaign last week have published a letter, seen by Reuters, calling for the president to support an immediate ceasefire, and a group of congressional staffers held a vigil on Wednesday at the Capitol demanding a ceasefire, images on social media showed.

While some sources say there has been “deep frustration” among members of working-level staff at the State Department, several US officials say while the Department leadership welcomes a diverse set of voices, it is unlikely to profoundly change Biden’s policy.

In a briefing earlier on Monday, Department spokesperson Matthew Miller said Blinken has met with a number of people from different bureaus within the agency to hear what they think about the policy over Israel-Hamas fight.

“He encourages people to provide feedback. He encourages people to speak up if they disagree. It doesn’t mean that we’re going to change our policy based on their disagreements,” Miller said.