'Have y'all tried grammar style check?' she wrote across the top of the note. After 17 years teaching, she had seen plenty of errors, but nothing quite like this before.
She also made a decision to do something about it, using a highlighter and pen to correct the letter and return it to the sender at 1600 Pennsylvania Avenue NW.
The former English high school teacher says that the letter she received his response, dated May 3, was full of grammatical errors.
She further explained that she would have given it a C grade, had it been written by any middle school student. So, Mason chose to correct the letter and send it back to the White House. Will be returning it tomorrow.
Among the most prominent mistakes in the president's letter were multiple instances of improper capitalization of common nouns such as "president" and "state".
The teacher recognized that the letter was likely written by a staffer.
Even so, she gave the person who penned the letter quite the tongue lashing.
"Poor writing is not something I abide", said Mason.
Another user commented: "Anyone here think President Trump actually, wrote this letter?"
In her original letter, she urged Mr Trump to individually meet with the families who lost loved ones at the Stoneman Douglas High School massacre.
What Mason is clear about is her dismay with the overuse of the "I" in Trump's letter.
"It's stylistically appalling", Mason said to CNN.It also mentioned the STOP School Violence Act of 2018, and mentioned a Trump directive for the Justice Department to "issue a rule banning devices, such as bump stocks".