President Donald Trump’s signature is getting a lot of attention after the House Oversight Committee obtained an infamous 2003 “birthday book” gifted to the late sex offender Jeffrey Epstein that appears to include a signed note from none other than Trump himself.

While people online debate whether Trump is really the author of the birthday note to Epstein, a handwriting analyst told HuffPost what signs to look out for, in general, when analyzing someone’s handwriting for authenticity.

Trump has vehemently denied that he wrote the 2003 letter to Epstein, which features printed text within a hand-drawn outline of a female body and bears Trump’s name and apparent signature.

The president filed a lawsuit against The Wall Street Journal in July after it was the first to report on the birthday note’s existence.

Public interest in the note resurged this week after Democrats on the Oversight Committee released an image of it on Monday.