Follow our live coverage of Marie Yovanovitch’s public impeachment inquiry hearing.

WASHINGTON — State Department Foreign Service officers usually express their views in formal diplomatic cables, but these days they are using closed Facebook groups and encrypted apps to convey their pride in Marie L. Yovanovitch, the ousted ambassador to Ukraine, whose House testimony opened the floodgates on the impeachment inquiry into President Trump.

#GoMasha is their rallying cry.

In private conversations, they trade admiring notes about career State Department officials like William B. Taylor Jr. and George P. Kent, who delivered damning testimony about a shadow Ukraine policy infected by partisan politics and presidential conspiracy theories, and William V. Roebuck, a senior diplomat in Syria who wrote a searing memo on how Mr. Trump abandoned the Kurds and upended American influence.

And they are opening their wallets to help raise money — including nearly $10,000 last Monday alone — to offset the legal bills of department officials called to testify before Congress.

Rarely has the State Department, often seen as a staid pillar of the establishment, been the center of a revolt against a president and his top appointees. But as a parade of department officials has recounted to lawmakers how policy was hijacked by partisan politics, many career diplomats say they have been inspired by their colleagues’ willingness to stand up to far more powerful voices after nearly three years of being ignored or disparaged by Mr. Trump and those he has chosen to lead the department.