America's first "Twitter presidency" has yet to officially begin, but President-elect Donald Trump has already slammed United Technologies , General Motors (GM) - Get Report and other big firms through tweets criticizing their offshoring plans. However, Jim Cramer says investors should actually buy stocks of companies that Trump calls out.

"United Technologies was the victim of a [Trump] tweet [and] United Technology stock goes higher, not lower," Cramer said Wednesday in an exclusive conference call for members of TheStreet's Action Alerts PLUS investors club. "GM under attack -- what happens to the stock? Higher, not lower.

"What does that say to me? That if you decide to make a strategy based on [Trump's] tweets, you better make it a buy strategy -- because [Trump's criticism] clearly hasn't had any lasting effect," Cramer said.

As such, the stock-picker said that he and AAP's research staff are "going to look and see opportunities [in Trump's tweets] in the same way that United Technologies was a 'pull-the-trigger' situation."

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