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President Trump has threatened to ban US diesel exports in an effort to lower domestic fuel prices ahead of the November midterm elections, a move that has raised alarm across European economies dependent on American diesel supplies. The US has signaled it may ask Europe to release its own diesel reserves to offset the impact, with Washington urging European governments to prepare their fuel supplies for a potential ban. The threatened export restrictions reflect the political pressure Trump faces over rising fuel costs domestically, but risk triggering a diesel supply crunch in Europe, which relies heavily on American exports for its own energy needs.