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 comments came just a month after he pledged not to use information stolen by foreign adversaries in his 2020 re-election campaign, even as he wrongly insisted he hadn't used such information to his benefit in 2016.
Trump took a dig on Tuesday at Nadler and House Intelligence Committee chairman Adam Schiff, one of the president's strongest critics in Congress about the Russia investigation.
Trump and his fellow Republicans have sought to make the caravan and immigration major issues ahead of the Nov 6 midterm congressional elections, in which the president's party is trying to maintain control of the House of Representatives and the Senate.
Trump is due to arrive on Thursday afternoon, straight from the NATO summit.
Trump raised the possibility on Thursday of delaying the country's presidential election in November, alleging that "universal mail-in voting" will make the 2020 election "the most inaccurate and fraudulent" in history.
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Trump's largest donor was the America First Action SuperPAC, with million apiece coming from Timothy Mellon, chairman and majority owner of Pan Am Systems, and Kelcy Warren, co-founder, chairman and CEO of Energy Transfer Partners, a Texas company that runs the Dakota Access Pipeline.
Trump, who has complained about US trade deficit with India, issued a presidential proclamation last year removing 50 items from a list of Indian products subject to the GSP, effective from Nov. 1, 2018. Washington has a 21-billion-dollar trade deficit with New Delhi in 2018, according to the US Census Bureau.
Trump's words came one day after reports, citing anonymous officials of the White House, revealed Pempeo's top-secret visit as Trump's envoy in recent weeks.
Trump on Tuesday dismissed the report. However, he noted that "hopefully we're not going to have to plan for that. And if we did that, we'd send a hell of a lot more troops than that."