As Donald Trump begins to roll out his plans for the “largest deportation operation in history,” Mexico, the country with the highest number of unauthorized citizens living in the US — some 4 million people — is preparing to welcome back thousands of deportees.

Protesters took to the streets of a Mexican city shaken by cartel infighting Thursday, raiding a government office and demanding justice for two children shot and killed in the violence.

Mexico and Canada are putting aside their differences and forming a more united front as they try to head off US President Donald Trump’s threat to impose steep tariffs on them as soon as next week. Since winning the election in November Trump has repeatedly threatened his country’s two largest trading partners with tariffs of 25 per cent on all exports to the US in retaliation for what he says are rising levels of illegal immigration and the trafficking of the opioid fentanyl into the country.