BRUSSELS — Ursula von der Leyen, president of the European Commission, is expected to face a no-confidence vote in the European Parliament this week. While the measure is likely to fail, it will be a symbolic challenge to the European Union’s top official at a time of high tension.

Von der Leyen appeared before Parliament on Monday for a debate to address the complaints against her before the vote, which is scheduled for Thursday.

The challenge originated from Europe’s far right: Gheorghe Piperea, a parliamentary newcomer from Romania who belongs to a political group that is often critical of the European Union, accused von der Leyen’s commission, the EU’s executive arm, of “failures to ensure transparency.”

The complaint referred to a lawsuit filed by The New York Times over the commission’s denial of a request for records of text messages between von der Leyen and Dr. Albert Bourla, Pfizer’s CEO, when she was trying to procure coronavirus vaccines.

The General Court in Luxembourg sided with the Times, ruling in May that von der Leyen’s commission did not provide enough of an explanation in refusing the request for her text messages with the Pfizer executive.

Piperea’s complaint also referred to the commission’s push to ramp up joint defense procurement and to carry out digital laws. He asserted in a filing that the commission’s behavior had been repeatedly opaque and “undermines trust.”