Trump hit back from his resort home in Florida, questioning the independence of federal judges appointed by his predecessor and confirmed by the US Senate. He especially criticized judges on California's 9th US Circuit Court of Appeals.
Trump administration officials have repeatedly blamed US laws protecting asylum seekers for encouraging fraudulent or non-deserving claims.
Trump's announcement on May 8 to withdraw the US from the Iran nuclear deal, or the Joint Comprehensive Plan of Action (JCPOA), is the latest piece of evidence that the US cannot honor an international deal. The UN Security Council unanimously endorsed the deal, after it was reached on July 14, 2015, between Iran and five permanent members of the United Nations Security Council - the United States, China, Russia, Britain and France - plus Germany and the European Union.
Trump has expressed concerns about ballot fraud and has cited a May incident in Paterson, New Jersey, in which four men, including a City Council member, were charged with voting fraud related to mail-in ballots.
Trump will be flanked by border officials and people who have had family members killed by someone who is in the United States illegally during the 3:30 p.m. (1930 GMT) event, spokesman Hogan Gidley told reporters.
Trump was alleged to have pressured his Ukrainian counterpart, Volodymyr Zelensky, into launching investigations that could politically benefit him by withholding military aid from Ukraine. Furthermore, the White House allegedly tried to cover it up.
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Trump has weighed in on Twitter all week with comments that have aroused concerns his administration is weakening the rule of law.
Trump said his order would waive several key regulations.
Trump frequently describes illegal immigrants-a tiny minority of whom have formed groups to attempt walking hundreds of miles to the US border-as "rapists" and "thugs".
Trump opened the Trump International Hotel, just blocks from the White House, shortly before he was elected in November 2016. Unlike past presidents, he has retained ownership of numerous business interests, including the hotel, while serving as president.