President Donald Trump declared China the “grand champions” of currency manipulation on Thursday, just hours after his new Treasury secretary pledged a more methodical approach to analyzing Beijing’s foreign exchange practices. In an exclusive interview with Reuters, Trump said he has not “held back” in his assessment that China manipulates its yuan currency, despite not acting on a campaign promise to declare it a currency manipulator on his first day in office. “Well they, I think they’re grand champions at manipulation of currency. So I haven’t held back,” Trump said. “We’ll see what happens.” During his presidential campaign Trump frequently accused China of keeping its currency artificially low against the dollar to make Chinese exports cheaper, “stealing” American manufacturing jobs. But Treasury Secretary Stephen Mnuchin told CNBC on Thursday he was not ready to pass judgment on China’s currency practices.