According to Town Hall:

Democrat Senator Chuck Schumer recently sent a letter to the White House demanding answers to a series of questions about the Defense Production Act, which President Trump has used sparingly during the Wuhan coronavirus crisis. A number of American companies, with a few exceptions, have voluntarily stepped up to manufacture necessary medical supplies, such as ventilators and masks. 

Thursday night, President Trump responded and did not mince words. 

"Dear Senator Schumer: Thank you for your Democrat public relations letter and incorrect sounds bites, which are wrong in every way," Trump wrote. "If you spent less time on your ridiculous impeachment hoax, which went haplessly on forever and ended up going nowhere (except increasing my poll numbers), and instead focused on helping the people of New York, then New York would not have been so completely unprepared for the 'invisible enemy.' No wonder AOC and others are thinking about running against you in the primary. If they did, they would likely win." 

"Fortunately, we have been working with your state and city governments, Governor Andrew Cuomo and Mayor Bill DeBlasio, to get the job done. You have been missing in action, except when it comes to the 'press.' While you have states that you don't like Answer Cuomo, you ought to start working alongside him for the good of all New Yorkers," he continued. "I've known you for many years, but I never knew how bad a Senator you are for the state of New York, until I became President."

Schumer has consistently been a critic of President Trump but has scored many victorie

https://trumptrainnews.com/articles/president-trump-sends-epic-letter-to-schumer-slamming-him