With the Senate out of session, Ms.

Sinema, the Democratic senator from Arizona, has been in Europe on a fund-raising trip.

Sinema in person — she’s in Europe on a fund-raising trip.

Sinema said she had participated in fund-raising for the Democratic Senatorial Campaign Committee but declined to say where or provide any additional details.

The chairman of the Democratic Senatorial Campaign Committee, Senator Gary Peters of Michigan, is also in Europe this week and headlined a dinner on Wednesday in London, with contribution levels as much as $36,500, according to a copy of an invitation.

A spokesman for the Senate committee declined to comment on the events in Europe or on Ms.

“So far this week, Senator Sinema has held several calls — including with President Biden, the White House team, Senator Schumer’s team, and other Senate and House colleagues — to continue discussions on the proposed budget reconciliation package,” Mr.

Sinema is one of the most closely watched Senate Democrats in the country as one of two centrists, along with Senator Joe Manchin of West Virginia, who have objected to the price of Mr.

Sinema has pushed for the House to adopt a separate, bipartisan $1 trillion infrastructure bill while the larger budget package is being negotiated.