Trump is expected to go ahead with the Warsaw visit.
Trump's "America First" policy, which features unilateralism and protectionism, is deeply resented in Europe.
Trump has vowed to contest the election results on several fronts, including the Supreme Court. A recount will be held in Georgia, where the margins are tight, and Trump's campaign also plans to seek recounts in Wisconsin, Pennsylvania and Arizona.
Trump says US troops in Afghanistan should return home by Christmas - World - Chinadaily.com.cn
Trump held his call with campaign staffers from Las Vegas, where he was on the third day of a western campaign swing. He was to hold Arizona rallies in Prescott and Tucson later in the day before returning to the White House.
Trump later took to Twitter to criticize Whaley and Brown:
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Trump, who was impeached last month by the Democratic-led House of Representatives on charges of abuse of power and obstruction of Congress, is accused of pressuring Ukraine to investigate former Democratic Vice President Joe Biden, a political rival, and then impeding the inquiry into the matter.
Trump has been widely expected to reshuffle after the Nov 6 midterm elections and before the start of the second half of his first term.
Trump told reporters that selecting his daughter would spark concerns about nepotism. But he also said there is no one more competent in the world for the role than Ivanka.
Trump quickly fired back on Twitter railing against the vote, tweeting: "The Greatest Witch Hunt In American History!"