Updated On: 08 March, 2016 03:05 PM IST | | PTI
<p>US Republican presidential front-runner Donald Trump faces a tough test today when the party's key primaries will be held in four states of Hawaii, Idaho, Michigan and Mississippi as the gap between him and his rivals has narrowed</p>

Washington: US Republican presidential front-runner Donald Trump faces a tough test today when the party's key primaries will be held in four states of Hawaii, Idaho, Michigan and Mississippi as the gap between him and his rivals has narrowed.

Donald Trump