President Trump praised the coronavirus vaccine from Massachusetts-based biotech company Moderna as one of two recent “great discoveries” after it announced Monday the vaccine is 94.5% effective according to interim analysis from a late-stage clinical trial.

The Moderna announcement came one week after Pfizer and BioNTech said their vaccine also tops 90% effectiveness.

In a Monday tweet, Trump asked “great ‘historians'” to “please remember that these great discoveries, which will end the China Plague, all took place on my watch!”