President Trump insisted Monday that Mexico would indeed pay for his proposed barrier along the U.S.-Mexican border, a day after the country said in a strong statement that it would not.

"One way or another, Mexico is going to pay for the wall," the president said during a press conference. "It may be through reimbursement, but one way or another, Mexico will pay for the wall."

He later added that the initial funding may come from the United States, but that Mexico would "ultimately" pay for it.

Never mind that Mexico wants nothing to do with it.

"As the Mexican government has always stated, our country will not pay, under any circumstances, for a wall or physical barrier built on U.S. territory along the Mexican border," Mexico's foreign ministry said in a statement released Sunday. "This statement is not part of a Mexican negotiating strategy, but rather a principle of national sovereignty and dignity."

The Mexican statement followed tweets from the president the president on Sunday, which included the same ideas he emphasized during the press conference.

Mexico also addressed the president's assertions about its crime rates, saying that it was a "shared problem." The only way to end it was to address its causes: high demand for drugs in the United States and supply from Mexico and other countries.

"Transnational criminal organizations have killed thousands of Mexicans, including members of the Armed Forces and police officers, and thousands of Americans," the ministry wrote. "Only on the basis of the principles of shared responsibility, teamwork and mutual trust will we be able to overcome this challenge."

The president's response on Monday: to continue insisting that "we need the wall very badly" because of crime and drugs.

"Tremendous drugs are pouring into the United Sates, at levels no one has ever seen before," he said. "The wall will stop much of the drugs from pouring into this country and poisoning our youth."

The president also suggested via Twitter that the United States could pull out of the North American Free Trade Agreement, which he criticized long before he took office.

He doubled down on this Monday, calling NAFTA was one of "the worst trade deals ever signed."

Mexico said it would not renegotiate the deal over social media or other platforms. The second round of renegotiation talks are set to take place in Mexico City later this week.

"Mexico's position at the renegotiation table of the North American Free Trade Agreement (NAFTA) will continue to be serious and constructive, always putting our national interests first, and seeking a beneficial result whereby the three North American countries win," the ministry wrote.

Mexico's Sunday statements are in line with what has already been publicly stated by the country several times before. A recently leaked phone conversation between Trump and Mexican President Enrique Peña Nieto revealed Trump had asked Mexico's leader to soften public opposition to the wall back in January. Peña Nieto retorted that his country wouldn't pay for the barrier.