Trump is expected to go ahead with the Warsaw visit.
Trump visited his brother on Friday at a New York hospital after being told he was seriously ill. The cause of the death has not yet been revealed.
Trump also has said he might declare a national emergency at the border to circumvent Congress’ budgetary power by tapping Defense Department funds to pay for construction of a wall along the border with Mexico.
Trump said he would be ending joint military exercises between the United States and the Republic of Korea.
Trump spoke during an event showcasing the Paycheck Protection Program, a loan program designed to help small businesses weather the pandemic.
Trump's plan to ban arrivals from seven mostly Muslin countries, which is held up in court, along with tough trade and immigration talk has some American tourism officials concerned about the potential fallout.
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Trump said he looks forward to meeting with President Xi Jinping on the sidelines of the G20 Leaders' Summit in Osaka, Japan (June 28-29), to discuss in-depth bilateral ties and issues of common concern, the Xinhua News Agency reported.
Trump has threatened to withdraw from the organization throughout the pandemic. Despite wide criticism, he announced on Friday that the US would terminate its relationship with the WHO.
Trump met with his national security team on the situation in Syria later in the day and "no final decision has been made," the White House said in a statement.
Trump tweeted Wednesday morning that because of the task force's "success", it would "continue on indefinitely with its focus on SAFETY & OPENING UP OUR COUNTRY AGAIN".