By Ted Hesson

WASHINGTON (Reuters) -The Trump administration aims to tighten the duration of visas for students, cultural exchange visitors and members of the media, according to a proposed government regulation issued on Wednesday, part of a broader crackdown on legal immigration.

President Donald Trump, a Republican, kicked off a wide-ranging immigration crackdown after taking office in January. The latest move would create new hurdles for international students, exchange workers and foreign journalists who would have to apply to extend their stay in the U.S. rather than maintain a more flexible legal status.

The proposed regulation would create a fixed time period for F visas for international students, J visas that allow visitors on cultural exchange programs to work in the U.S., an

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