Trump steps up pressure on Mexico to stop immigrants as tariff threat looms

U.S. President Donald Trump told Mexico to stop the "invasion" and "onslaught" of migrants entering the United States illegally or face rising U.S. import tariffs which would cause the loss of foreign investment. "Mexico should step up and stop this onslaught, this invasion into our country," Trump said during a news conference in London on Tuesday. 

(With inputs from agencies.)