Secretary of State Condoleezza Rice said Thursday that al-Qaida and other terrorist groups are doing everything they can to get into the United States through Mexico and Canada. Rice, on her first trip to Mexico since taking over at the State Department in late January, echoed concerns raised by government officials in congressional testimony last month about the motives of the terrorist network blamed for the Sept. 11 attacks of 2001. "Indeed we have from time to time had reports about al-Qaida trying to use our southern border but also trying to use our northern border," Rice said. "There is no secret that al-Qaida will try to get into this country and into other countries by any means they possibly can."Recent intelligence from current investigations, detentions and other sources suggests that al-Qaida has considered using the Southwest border to infiltrate the United States, according to testimony from a top Homeland Security Department official last month before the Senate Intelligence Committee.