Mexico still needs to be careful in handling its relations with the new U.S. administration, though the two countries have seen warming ties recently, said a foreign ministry official on Monday.
"I believe we need to be careful with the new government," said Guillermo Ordorica Robles, a senior official in the ministry's North American department.
"We also need to be very careful in (dealing with) drug trafficking...to make sure sovereignty is not weakened in some sense."
U.S. Secretary of State Hillary Clinton proposed to establish an intelligence collecting and sharing mechanism with Mexico on fighting against drug trafficking during her visit to Mexico in March. But some Mexican politicians fear the initiative could be an encroachment on Mexican sovereignty.
U.S. President Barack Obama's just-concluded visit to Mexico signaled warming ties between the two countries, though some thorny issues that have complicated their bilateral relationship still remain.
Obama arrived in Mexico on Thursday for a two-day visit before traveling on to Trinidad and Tobago for the fifth Summit of the Americas.
During Obama's stay in Mexico, the two countries agreed on a new partnership to combat climate change and promote environmentally-friendly forms of energy production.
Obama also said the U.S. was to blame for much of Mexico's drug violence, and he set up a major congressional gun-control battle by calling on the Senate to ratify a treaty designed to track and cut the flow of guns to other countries.
Obama's remarks came after Mexican Ambassador to the United States Arturo Sarurkhan said that 90 percent of the weapons in his country came from the United States, where gun laws are looser.
Though Obama made verbal commitments to fighting gun smuggling, he did not sign any documents on the issue during his stay in Mexico, Ordorica pointed out.
Moreover, the U.S. said it could actually do little about smuggling guns into Mexico, because of the second amendment of the U.S. constitution that enshrines citizens' right to bear arms, added Ordorica.