US President Donald Trump took a jab at the European Central Bank President Mario Draghi on Twitter.
The euro fell on Tuesday after Mr Draghi said "additional stimulus will be required" if inflation does not pick up pace.
"Mario Draghi just announced more stimulus could come, which immediately dropped the Euro against the Dollar, making it unfairly easier for them to compete against the USA," Mr Trump wrote on Twitter.
"They have been getting away with this for years, along with China and others."
Mr Trump has repeatedly and openly put pressure on the US Federal Reserve to cut interest rates to help support the US economy.