WASHINGTON     -      A top US diplomat testified Tuesday that President Donald Trump was holding back military aid for Ukraine unless the country agreed to investigate Democrats and a company linked to Joe Biden’s family, providing lawmakers with a detailed new account of the quid pro quo central to the impeachment probe. In a lengthy opening statement to House investigators obtained by The Associated Press, William Taylor described Trump’s demand that “everything” President Volodymyr Zelenskiy wanted, including vital aid to counter Russia, hinged on making a public vow that Ukraine would investigate Democrats going back to the 2016 US election as well as a company linked to the family of Trump’s potential 2020 Democratic rival. Taylor testified that what he discovered in Kyiv was the Trump administration’s “irregular” back channel to foreign policy led by the president’s personal lawyer, Rudy Giuliani, and “ultimately alarming circumstances” that threatened to erode the United States’ relationship with a budding Eastern European ally facing Russian aggression. In a date-by-date account, detailed across several pages, the seasoned diplomat who came out of retirement to take over as charge d’affaires at the embassy in Ukraine details his mounting concern as he realized Trump was trying to put the newly elected president of the young democracy “in a public box.” “I sensed something odd,” he testified, describing a trio of Trump officials planning a call with Zelenskiy, including one, Ambassador Gordon Sondland, who wanted to make sure “no one was transcribing or monitoring” it. Lawmakers who emerged after nearly 10 hours of the private deposition were stunned at Taylor’s account, which some Democrats said established a “direct line” to the quid pro quo at the center of the impeachment probe. “It was shocking,” said Rep. Karen Bass, a California Democrat. “It was very clear that it was required — if you want the assistance, you have to make a public statement.”