US elections 2016: Republicans desperately seek ways to stop Donald Trump

Though he has won 10 of the 15 primaries held, he has only received 46% of the delegates and 34% of votes, meaning two-thirds of Republicans favor other candidates.
Perhaps if the party rallied behind one candidate, then they could challenge Trump for the nomination.
The party, the so-called establishment, does not know how to react.
Usually, the party closes ranks around the favorite once it becomes clear that they have no strong rivals left.
The Republican Party is exhausting every possibility in its attempt to prevent Donald Trump from becoming the nominee for the November presidential elections.

Fuente: http://elpais.com/elpais/2016/03/03/inenglish/1457010457_610599.html