Everything you need to know about the Great American Eclipse of 2017

WATCH LIVE: Inauguration of Donald Trump

WASHINGTON, D.C. — After about two years’ worth of campaigning, a wild election and a tumultuous transition period, this Friday Donald Trump will become the 45th President of the United States.

Trump officially becomes President at noon ET/9 a.m. PT and will take the oath of office at his inauguration around that time.

It’s a historic moment as a man who has never before served in government ascends to the nation’s highest public office.

It's always hard to estimate crowd sizes, but many hundreds of thousands could show. In comparison, estimates pegged Obama's first inauguration crowd at 1.8 million and the second at about 800,000.

Stay on this page for live updates below:

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Pope Francis congratulated President Trump on his inauguration in a letter.

The Pope extended the new President good wishes and hoped that his decisions would be guided by the values that have helped shape the country.

“Upon your inauguration as the forty-fifth President of the United States of America,

I offer you my cordial good wishes and the assurance of my prayers that Almighty

God will grant you wisdom and strength in the exercise of your high office. At a time when our human family is beset by grave humanitarian crises demanding farsighted and united political responses, I pray that your decisions will be guided by the rich spiritual and ethical values that have shaped the history of the American people and your nation’s commitment to the advancement of human dignity and freedom worldwide. Under your leadership, may America’s stature continue to be measured above all by its concern for the poor, the outcast and those in need who, like Lazarus, stand before our door. With these sentiments, I ask the Lord to grant you and your family, and all the beloved American people, his blessings of peace, concord and every material and spiritual prosperity.”

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Protesters are pepper sprayed before the inauguration.

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Donald Trump is sworn in as the 45th US president by Supreme Court Chief Justice John Roberts in front of the Capitol.

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“When America is united, America is totally unstoppable.” – President Trump.

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“When America is united, America is totally unstoppable.” – President Trump.

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TRUMP: “From this day forward, it’s going to be only America first.”

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President Elect Donald Trump waves to spectators as Vice President Elect Mike Pence and Melania Trump look on at the West Front of the U.S. Capitol in Washington, DC.

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US President-elect Donald Trump arrives for his Presidential Inauguration at the US Capitol in Washington, DC

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US Vice President-elect Mike Pence arrives for the Presidential Inauguration of Donald Trump at the US Capitol in Washington, DC.

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President Barack Obama, Sen. Chuck Schumer (D-NY), Rep. Nancy Pelosi (D-CA) and Vice President Joe Biden arrive on the West Front of the U.S. Capitol.

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Donald Trump, Jr., and Ivanka Trump arrive for the Presidential Inauguration of their father.

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