Four U.S. officials called to testify by Democrats leading the impeachment inquiry into U.S. President Donald Trump will not show up as requested on Monday.
Trump loyalists have refused to appear before Democratic-led committees in the U.S. House of Representatives, ramping up the tussle between the White House and lawmakers over their power to conduct investigations.
Some Democrats said Trump should face an obstruction of justice charge among the impeachment counts they plan to consider against him.
The testimony of the four witnesses would have been part of the investigation into whether Trump used foreign aid to Ukraine as leverage to secure a political favor.
Lawmakers were especially interested in questioning the lawyer, John Eisenberg, as democrats were expected to wrap up the closed-door testimony in coming weeks and begin public hearings.