Donald Trump and Ted Cruz each took two states in the caucus voting on "Super Saturday," and on Sunday both of them asked the other two candidates, Marco Rubio and John Kasich, to quit their campaigns so as to whittle down the Republican presidential race.
After taking Kentucky and Louisiana, Trump said at a news conference that he "would love to take on Ted Cruz one-on-one."
"Marco Rubio had a very very bad night and personally I call for him to drop out of the race. I think it's time now that he dropped out of the race. I really think so," said the real estate mogul.
Cruz for his part said after winning in Kansas and Maine that he believes that "as long as the field remains divided, it gives Donald an advantage."
Rubio and Kasich have yet to comment on the calls for them to step down.
So far Trump has won 12 states, Cruz has taken six, Rubio has one and Kasich has yet to win a state. In terms of delegates, Trump leads with 380, followed by Cruz at 297, and Rubio with 123. A full 1,237 delegates are needed in order to win the Republican primaries.
After Saturday's showing, many predict that only Cruz has enough momentum built up in his campaign to be able to stop Trump, who has gained media attention and popularity for his blunt style.
The votes come after last week senior members of the Republican party took aim at Trump, with Mitt Romney calling him a "fraud," in comments backed by Senator John McCain. Other GOP sources recently said they would even prefer Democratic candidate Hillary Clinton over Trump.