'Wonder who wrote this nice tweet': Trump offers surprisingly 'warm condolences' to Cummings family

President Donald Trump offered his "warmest condolences" to the family of Rep. Elijah Cummings, who died at 68 -- but many had doubts about who wrote that message.

The president had frequently attacked Cummings, who commanded respect and admiration from Democrats and Republicans alike, and social media users had been waiting to see Trump's reaction to the Maryland Democrat's passing.

Trump extended a message to the lawmaker's family and friends, and said that Cummings' voice would be nearly impossible to replace.

"My warmest condolences to the family and many friends of Congressman Elijah Cummings," Trump tweeted. "I got to see first hand the strength, passion and wisdom of this highly respected political leader. His work and voice on so many fronts will be very hard, if not impossible, to replace!"

Other Twitter users expressed doubts that Trump wrote the tweet himself, and recalled some of the president's ugliest slurs and attacks against Cummings over the years.