As polling stations opened Monday in Germany, acrimony has been rising among the Turks here whose votes are crucial in the tight race over whether to expand the powers of Turkish President Recep Tayyip Erdogan.

The 1.4 million eligible Turkish voters in Germany represent about half the total number of expatriates who can cast ballots, and the fight for their support has been fierce.

So far the headlines have focused on tensions between the two leaders. Erdogan, who has been trying to woo the Turks in Germany with rallies and rhetoric, has accused German officials of acting like Nazis for blocking his supporters from holding rallies ahead of the referendum. The move infuriated many in Germany, prompting Chancellor Angela Merkel to threaten that Berlin will take "all necessary measures" unless he stops the comparisons.

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