U.S. President Donald Trump has already given the global economy trade wars. Now there are signs he may be gearing up for a currency war, too.

With a series of tweets Tuesday aimed at the European Central Bank (ECB) and an announcement by Mario Draghi, its president, that he was prepared to cut interest rates further below zero in response to Europe’s slowing growth, Trump made a rare American presidential intervention into another economy’s monetary policy.

“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. They have been getting away with this for years,” he tweeted. Later, he added: “German DAX way up due to stimulus remarks from Mario Draghi. Very unfair to the United States!”

It was not the first time Trump has blamed currency manipulation overseas for a strong dollar that raises the cost of U.S. exports. He has already become unique among recent American presidents in a shift away from the “strong dollar” policy of his predecessors.

By targeting Draghi directly and responding in real time to an overseas central bankers’ policy pronouncement, Trump was dialing up the heat — just as his own Federal Reserve was gathering in Washington to decide on rates in a decision expected today.

Coming just days ahead of a summit with other Group of 20 leaders in Japan, the salvo served to highlight his administration’s increasingly aggressive currency policies and the place he sees for them in his trade arsenal.

“They are preparing the ground, they are laying out the potential tools they may have at their disposal,” said Cesar Rojas, global economist at Citigroup Global Markets Inc., though he added “we’re not at a currency war just yet.”

Finance ministers and central bankers this month agreed that a currency war is in no one’s interest. They reaffirmed commitments made in March 2018 to refrain from competitive devaluations.

Last month, the U.S. Treasury increased the number of economies it scrutinizes to 21 from 12 and expanded its watch list from four to nine, adding countries such as Ireland, Italy and Singapore under new tougher criteria.

The U.S. Commerce Department on May 23 proposed allowing U.S. companies to seek trade sanctions against goods from countries with “undervalued” currencies, though it said it did not intend to target independent central banks or their monetary policy decisions. (SD-Agencies)