President Donald Trump on Thursday again expressed dissatisfaction with the U.S. dollar's strength, saying the Federal Reserve's interest rates were harming American manufacturers.

"The Fed's high interest rate level, in comparison to other countries, is keeping the dollar high, making it more difficult for our great manufacturers like Caterpillar, Boeing, John Deere, our car companies, & others, to compete on a level playing field," Trump said in a series of tweets. 

“As your President, one would think that I would be thrilled with our very strong dollar. I am not!” Trump said in a tweet. 

Trump’s tweets mark his latest assault on the central bank and complaints over the dollar’s value as he wages an increasingly heated trade war with China.

The Republican president has for months been calling on Fed Chairman Jerome Powell and Fed policymakers to lower interest rates to support the U.S. economy.

At the end of July, Fed policymakers cut interest rates for the first time since 2008. 

Material from Bloomberg and Reuters has been used in this report.

• Trump Says U.S. Federal Reserve 'Too Proud to Admit Mistakes’ 
• Former Fed Chairs Say US Central Bank Must Be Free of 'Political Pressure’