Walmart ( WMT ) , the largest retail chain in the U.S., has sent a harsh message to employees after a controversial U.S. Supreme Court ruling.

For years, President Donald Trump has promoted his plan to secure the U.S. borders and conduct mass deportations of immigrants who are in the country illegally.

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"Illegal immigration costs our country billions and billions of dollars each year…And I will therefore take every lawful action at my disposal to address this crisis," said Trump during a briefing in the White House in 2018.

Related: IRS sends stern warning to employees after layoffs

Shortly after Trump was sworn in for a second term as president in January, he signed several executive orders focused on cracking d

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