The congressional impeachment inquiry of US President Donald Trump is gaining momentum.
More than 300 former officials from security and foreign policy agencies have now endorsed the motion.
They include a former chief of the National Counterterrorism Center and a deputy secretary of state.
Earlier this week House Speaker Nancy Pelosi announced she would launch the inquiry.
It comes after it emerged that Trump had asked Ukraine's president to investigate former Vice President and potential 2020 presidential election rival Joe Biden.
The US President allegedly did this while holding off aid to Ukraine.

No evidence alleged Bondi gunmen received military training in Philippines
At least 12 killed in Nigeria mining site attack
Russian attack on Ukraine's central Cherkasy injures six, causes blackouts
UN, aid groups warn Gaza operations at risk from Israel impediments
Israel approves natural gas deal with Egypt, Netanyahu says
US approves $11.1 billion largest-ever arms package for Taiwan
Trump adds seven countries to full travel ban list
Indian parliament votes to allow private firms in nuclear power sector
