Trump Ukraine call: Democratic calls for impeachment grow

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He told reporters "there was pressure put on, in respect to Joe Biden. What Joe Biden did for his son, that's something they should be looking at."

Mr Trump's remarks came after US media reported that days before his phone call with Mr Zelensky, Mr Trump instructed his acting chief of staff, Mick Mulvaney, to withhold nearly $400m in military aid for Ukraine.

But the US president insisted on Tuesday that nothing untoward happened during the "perfect call".

Mr Trump and his conservative allies have pointed out that Joe Biden, while US vice-president, threatened in 2016 to withhold aid to Ukraine unless it fired a top prosecutor whose office had opened an investigation into a natural gas company where Mr Biden's son, Hunter Biden, was a board member.

Other Western officials had also called for the same prosecutor to be removed for being soft on corruption. Ukraine's current prosecutor, Yuriy Lutsenko, told Bloomberg News in May he had no evidence of wrongdoing by Mr Biden or his son.

Congressional Democrats are demanding a transcript of the Trump-Zelensky phone call, which the White House has declined to release.

What's the latest on impeachment

On Tuesday, Speaker Nancy Pelosi, the most powerful elected Democrat, is holding a closed-door meeting with House members to consider impeaching Mr Trump.

Mrs Pelosi has so far resisted calls among her liberal rank-and-file to remove the Republican president from office.

On Monday night, the Washington Post published an op-ed by seven freshman Democrats - all with backgrounds in the US military and intelligence agencies - who said the "stunning" accusations against Mr Trump amounted to "a national security threat".

"If these allegations are true, we believe these actions represent an impeachable offence," wrote the lawmakers. "We do not arrive at this conclusion lightly."

The representatives - Gil Cisneros of California, Chrissy Houlahan of Pennsylvania, Abigail Spanberger and Elaine Luria of Virginia, Jason Crow of Colorado, Mikie Sherrill of New Jersey and Elissa Slotkin of Michigan - all serve in districts previously held by Republicans.

Nearly a dozen additional Democrats have come out in favour of impeachment over the last week since the Ukraine phone call controversy came to light.

More than 145 House Democrats now back such a move - more than half of the party's 235 members in the lower chamber of Congress.

But impeachment currently lacks the support of most US voters. A recent opinion poll found that 59% oppose removing the president from office.

Under the US Constitution, the House has the power to impeach a president for "high crimes and misdemeanours" and the Senate then holds a trial on whether to remove the president from office.

But the Senate is under Republican control and is seen as highly unlikely to convict the president.