Republican front-runner Donald Trump laid it on presidential hopeful John Kasich Sunday, demanding that the Ohio Gov. drop out of the GOP race immediately. The business mogul-turned-presidential candidate claims that Kasich was taking some of his votes off by staying in the race, and quite simply, such tactics were unfair.

Trump further stated that he already expressed his reservations about the other GOP candidate during his recently-conducted meeting with the Republican National Committee last week.

"All he's doing is just, he goes from place to place, and loses, and he keeps running. Well, why doesn't Marco Rubio do that? Why doesn't Jeb Bush do that? Why didn't all of them do that?" Trump said.

"Now if he wants to go and have his name put in nomination in the convention, he can do that. He doesn't have to run and take my votes. Because he's taking my votes. He's not taking Cruz's votes. He's taking my votes."

Trump's statements on Sunday might be indicative of the growing unease on the bold GOP candidate's campaign. Though he still leads against his rivals by a significant margin, a series of controversies last week, most notably his statements involving abortion, might have created a very real speed bump for his so-called "Trump Train."

With the Wisconsin primaries coming, Trump must be able to put on a good show. This is especially due to his loss in a very important state, Iowa, where rival Ted Cruz completely dominated.

Unfortunately for Trump, a number of polls in the state are so far predicting a very similar turnout to that of Iowa. One poll, conducted by the Marquette Law School, has shown the business mogul trailing his rival by a full 10 percent.

Thus, with Ted Cruz closing in on his numbers, future votes have never been as important for Trump. Hence, the sheer presence of candidate John Kasich still being in the race has touched a raw nerve on the front-runner.

"It's very unfair because he's taking our votes. Anybody could have stayed in. You could have had Jim Gilmore stay in. I mean, to be honest with you, Gilmore could have just stayed in. A guy like George Pataki could have just stayed in, he had zero. So it's very unfair that Kasich stays in, is my opinion," Trump said.

Trump's controversial campaign for the presidency has recently become even more controversial, with his recent rallies plagued by violence and strong statements bordering on abuse. His brazen attacks targeting a number of groups, including his own party, have gotten to a point where securing a nomination this coming July might finally end up getting tricky.