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How Jeb Bush and Donald Trump Have Put a Surging Marco Rubio on Defense

His rivals' attacks are having an impact on Rubio's behavior if not his standing in the polls.

Marco Rubio Hits Back Against Donald Trump's Attack

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Senator Marco Rubio seems to be deftly swatting away attacks from rivals Donald Trump and Jeb Bush, but the barrage coming his way over missed Senate votes, immigration reform, and mismanagement of personal finances have prompted him to quietly fine-tune his campaign as he rises in the polls and picks up big donors.

Moments before he formally filed for the presidential ballot Wednesday in Concord, New Hampshire, Trump told reporters that Rubio, who posted a strong third-place showing in two national polls released this week, has "very big issues" with his finances—specifically, having put thousands of dollars in personal expenses on a GOP American Express card while in the Florida state house—and is "very weak on illegal immigration. As you know, if it's up to Marco Rubio people can just pour into the country."