Donald Trump is facing major backlash for the tweet he sent out Sunday following the Orlando, FL, massacre, the deadliest mass shooting in the US [1].

Appreciate the congrats for being right on radical Islamic terrorism, I don't want congrats, I want toughness & vigilance. We must be smart!

— Donald J. Trump (@realDonaldTrump) June 12, 2016 [2]

The presumptive GOP presidential nominee said he was thankful for being congratulated for "being right" on his hard-line stance against groups like ISIS — prompting many to call him egotistical for using the moment to campaign instead of being sympathetic to the 49 victims who died in the club shooting.

Check out some of the reactions to his tweet:

?? @realDonaldTrump [3] Are you really using this moment to campaign? What is wrong this guy?? 😷

— Andres Saavedra (@Andres_Saavedra) June 12, 2016 [4]

Hey @realDonaldTrump [5] get off the soapbox and mourn. Empower the people don't gloat as if you predicted something. #NotFitToBePresident [6]

— William Constantine (@wmconstantine) June 12, 2016 [7]

@realDonaldTrump [8] Where are your thoughts of sympathy for the victims??? #egomaniac [9]

— Susan Steele (@steesu) June 12, 2016 [10]

@realDonaldTrump [11] your brand of narcissism is truly insane. you turn a mass shooting into an opportunity to accept praise. #deleteyouraccount [12]

— susie ghahremani (@boygirlparty) June 12, 2016 [13]

@realDonaldTrump [14] making a mockery of Americans in front of the world. You don't even respect your own people enough to put some condolences

— Sardar (@sardarslife) June 12, 2016 [15]