Trump later Sunday pushed the news media to divulge the whistleblower's identity, asserting that the person's accounting of events is incorrect. The whistleblower's complaint has been corroborated by people with firsthand knowledge of the events who have appeared on Capitol Hill.
Trump has met Putin twice as president, at the G20 summit in Germany last summer and briefly at the Asia-Pacific economic summit in Vietnam in November.
Trump himself ignored a question about climate change when asked by journalists during an unrelated event on Friday, although he did joke that Thursday's decision had proven "controversial".
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Trump said on Thursday that Mexico and Canada, the two countries that are renegotiating with the US the North American Free Trade Agreement (NAFTA), will be exempted for now. He said the tariffs will still apply to the US' two North American neighbors "if we don't make the deal on NAFTA and if we terminate NAFTA because they are unable to make a deal that's fair".
Trump had referenced a claim by former CIA analyst Larry Johnson that was carried by the right-wing cable channel One America News Network that said British intelligence services had assisted the Barack Obama administration by spying on Trump's 2016 run for the White House. The network has been widely accused of spreading false conspiracy theories.
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Trump spokesman Brian Morgenstern said the president was being briefed on economic stimulus negotiations and the progress of Hurricane Delta towards the US Gulf Coast.
Trudeau said testing is key to the fight against COVID-19 and 20,000 tests are carried out in Canada every day. "Testing must increase even further before we can reopen and restart our normal activities as a country."
Trump's surprise exit from the talks came shortly after the DPRK dismantled its nuclear test site in front of international journalists, a move that Republic of Korea authorities said was the "first step toward complete denuclearization of the peninsula".
Trump hasn't disclosed his tax returns since taking office in 2017, breaking both his promise made during the 2016 presidential campaign and a tradition kept by US presidential candidates for decades.