U.S. President Donald Trump responded to German Chancellor Angela Merkel's recent speech in which she called the United States and United Kingdom uncertain allies after contentious G7 and NATO meetings.

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"We have a MASSIVE trade deficit with Germany, plus they pay FAR LESS than they should on NATO & military. Very bad for U.S. This will change," Trump tweeted early Tuesday from his personal account.

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A senior German lawmaker from the Social Democrats, the junior partner in Merkel's ruling coalition, has since responded, saying that Trump's tweet makes clear that he views Germany as a political opponent.

"Donald Trump makes clear with his tweet that he views Germany as a political opponent," Thomas Oppermann, head of the Social Democrats' (SPD) parliamentary group, told reporters on Tuesday.

Meanwhile Social Democrat party leader, Martin Schulz reportedly called Trump a "destroyer of Western values."

The tweet echoed language Trump reportedly used last Thursday in a meeting with European Union officials in Brussels in which he said, "The Germans are bad, very bad."

Trump made the comments to EU Commissioner Jean-Claude Juncker and European Council president Donald Tusk, according to German news magazine Der Spiegel.

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On Sunday, German Chancellor Angela Merkel charged that Europe could no longer rely on its traditional allies in a swipe at the U.S. following difficult G7 and NATO summits.

Merkel did not mention by name the U.S. President, who criticized major NATO allies and refused to endorse a global climate change accord, but she told a packed beer tent in Munich that the days when Europe could completely count on others were "over to a certain extent".

"I have experienced this in the last few days," she said. "And that is why I can only say that we Europeans must really take our fate into our own hands."