A career US diplomat appeared before the House Intelligence Committee on Tuesday for a closed-door grilling as part of the ongoing impeachment inquiry.

George Kent — a deputy assistant secretary of state who oversees US policies regarding Ukraine and other former Soviet-bloc nations — arrived to answer a congressional subpoena, despite being ordered not to testify by the State Department, an official involved in the impeachment inquiry into President Trump said.

The probe centers on a July 25 phone call in which Trump asked Ukrainian President Volodymyr Zelensky to investigate the overseas business dealings of Hunter Biden, son of political rival Joe Biden.

Trump has strongly denied any wrongdoing in the call, while opponents have argued that he effectively set up a quid pro quo with Zelensky by dangling a substantial military aid package over the country’s head in exchange for the probe.

Kent’s appearance before the Democrat-led committee follows that of former Ambassador to Ukraine Marie Yovanovitch and Fiona Hill, a former expert on Russia for the National Security Council.

Kent ignored shouted questions from reporters as he arrived on Capitol Hill.

With Post wires