CLEVELAND, OH - JULY 20: Donald Trump arrives by helicopter as he and his family attend a welcome arrival event with Governor Mike Pence and his family at the Great Lakes Science Centre on July 20, 2016 in Cleveland Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images)

CLEVELAND, OH - JULY 20: Donald Trump arrives by helicopter as he and his family attend a welcome arrival event with Governor Mike Pence and his family at the Great Lakes Science Centre on July 20, 2016 in Cleveland Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images)

CLEVELAND, OH - JULY 20: Donald Trump arrives by helicopter as he and his family attend a welcome arrival event with Governor Mike Pence and his family at the Great Lakes Science Centre on July 20, 2016 in Cleveland Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images)

CLEVELAND, OH - JULY 20: Donald Trump arrives by helicopter as he and his family attend a welcome arrival event with Governor Mike Pence and his family at the Great Lakes Science Centre on July 20, 2016 in Cleveland Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images)

CLEVELAND, OH - JULY 20: Donald Trump arrives by helicopter as he and his family attend a welcome arrival event with Governor Mike Pence and his family at the Great Lakes Science Centre on July 20, 2016 in Cleveland Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images)

CLEVELAND, OH - JULY 20: Donald Trump and his family attend a welcome arrival event with Governor Mike Pence and his family at the Great Lakes Science Centre on July 20, 2016 in Cleveland Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images)

CLEVELAND, OH - JULY 20: Donald Trump and his family attend a welcome arrival event with Governor Mike Pence and his family at the Great Lakes Science Centre on July 20, 2016 in Cleveland Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images)

CLEVELAND, OH - JULY 20: Donald Trump and his family attend a welcome arrival event with Governor Mike Pence and his family at the Great Lakes Science Centre on July 20, 2016 in Cleveland Ohio. Republican presidential candidate Donald Trump received the number of votes needed to secure the party's nomination. An estimated 50,000 people are expected in Cleveland, including hundreds of protesters and members of the media. The four-day Republican National Convention kicked off on July 18. (Photo by Jeff J Mitchell/Getty Images)