By TAMAR LEWIN

President Obama begins an all-out push on Friday to get Congress to extend the low interest rate on federal student loans, White House officials said, an effort that is likely to become a heated battle along party lines. If Congress fails to act, the interest rate on the loans, which are taken out by nearly eight million students each year, will double on July 1, to 6.8 percent.

White House officials said the president was planning a sustained effort through the spring: On Friday, Education Secretary Arne Duncan will discuss the issue at a White House briefing, and on Saturday in his weekly address, the president will call on Congress to pass legislation preventing the rate hike.

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