WASHINGTON (Reuters) - U.S. President Donald Trump warned of Hurricane Irma s destructive potential on Friday as the Category 4 storm headed toward Florida and urged residents in its path to heed government recommendations.  This is a storm of absolutely historic destructive potential. I ask everyone in the storm s path to be vigilant and to heed all recommendations from government officials and law enforcement,  Trump said in a videotaped statement. (This story corrects first paragraph to say Irma is now Category 4) 