Some people, such as Jeb Bush, have said that Donald Trump is not qualified to be President. You can read about it here:
What are the actual qualifications?
US Constitution, Article II, Section I
5: No Person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President; neither shall any Person be eligible to that Office who shall not have attained to the Age of thirty five Years, and been fourteen Years a Resident within the United States.
Trump appears to meet these qualifications. Ted Cruz does not, and although the CIA built a somewhat believable legend for Obama ad-Dajjal, I still believe that he does not.
What are some of the disqualifications?
US Constitution, Article XIV
3: No person shall be a Senator or Representative in Congress, or elector of President and Vice President, or hold any office, civil or military, under the United States, or under any State, who, having previously taken an oath, as a member of Congress, or as an officer of the United States, or as a member of any State legislature, or as an executive or judicial officer of any State, to support the Constitution of the United States, shall have engaged in insurrection or rebellion against the same, or given aid or comfort to the enemies thereof. But Congress may by a vote of two-thirds of each House, remove such disability.
Trump is not disqualified in this manner, but Hillary and many of the other candidates definitely are. They voted and/or conspired to provide weapons and support to various terrorist groups who are our sworn enemies, including al-Qaeda.
Please, please, please grow up and examine what is really going on in this country.
And stop believing nincompoops like Jeb Bush.