Supporters of ex-Republican presidential candidate Ted Cruz won't let the Texas senator go down without a fight.<br />Currently, they're looking to seize control of the Republican platform and the rules governing the party’s July convention in a move that will thwart Donald Trump's effort to capture Cruz's delegates.<br />In an email sent Sunday to pro-Cruz convention delegates, a top aide to the Texas senator wrote that it was “still possible to advance a conservative agenda at the convention.”<br />Mr. Cruz’s supporters and other conservative activists are also deeply concerned about Mr. Trump’s general election agenda, and want to ensure that he does not alter the party’s platform.