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Emma Thompson says Donald Trump tried to see if there was any "Love Actually" between them ... though he did it in a way that sorta weirded her out.

The actress was dishing about a few different topics at the Locarno Film Festival in Switzerland this week ... and, she told a story about the billionaire allegedly trying to hook up with her. Everett Collection

DJT called her back in 1998 out of the blue while she was on the set of the film "Primary Colors," Thompson told the crowd ... though she thought someone was messing with her at first.

Thompson says Trump asked her to come and stay at one of his resorts ... adding the two could have dinner together. We can only imagine what desert might've entailed. Getty

ET says she thanked him for the offer but politely decline

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