Trump has posted a tweet from his @realDonaldTrump account mentioning "Obama" 1,464 times — the vast majority of them negative.

Donald_J__Trump_on_Twitter___Obama_has_admitted_that_he_spends_his_mornings_watching__ESPN__Then_he_plays_golf__fundraises___grants_amnesty_to_illegals__
Donald J. Trump/Twitter

Source: Twitter

1. Travel: Trump often vented on Twitter about Obama's taxpayer-funded travel.

Trump tweet about obama
Twitter

Obama's travel cost an estimated $97 million over his eight years in office. Trump has spent $21 million on travel in about three months.

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Trump's motorcade on its way to Trump International Golf Club in West Palm Beach, Florida, on April 14.
Thomson Reuters

Sources: CNN, Business Insider

2. Golf: Another one of Trump's favorite Obama critiques involved the former president's golf outings. He posted 16 tweets about Obama hitting the golf course.

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Twitter

"We pay for Obama's travel so he can fundraise millions so Democrats can run on lies," Trump tweeted in 2014. "Then we pay for his golf."

Trump tweet obama
Twitter

He also quoted other users' tweets criticizing Obama's golfing habits.

Trump tweet obama
Twitter

Eighty-seven days into his presidency, Trump has made 19 trips to the golf course. At the same point in their first terms, Presidents Obama and George W. Bush hadn't made any, and Bill Clinton had made three.

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Trump golfs with Japan's prime minister, Shinzo Abe, in Palm Beach on February 11.
Donald J. Trump/Facebook

Sources: New York Times, Business Insider

3. Syria: Trump argued extensively against US intervention in Syria, tweeting in July 2013: "WHAT WILL WE GET FOR OUR LIVES AND $ BILLIONS? ZERO."

Trump tweet obama syria
Twitter

After a chemical attack killed hundreds in the suburbs of Damascus in August 2013, Trump continued to ridicule the Obama White House's debate over whether to militarily engage Syria.

Trump tweet obama
Twitter

When a chemical attack killed dozens of Syrian citizens in April 2017, Trump authorized a military strike against Syrian President Bashar Assad's infrastructure and air field. Trump said the strike was in the vital national-security interest of the US.

US Syria missile strike
The guided-missile destroyer USS Porter (DDG 78) launches a Tomahawk missile on April 7.
Mass Communication Specialist 3rd Class Ford Williams/U.S. Navy via AP

Source: Business Insider

4. Transparency: Trump also accused the Obama administration of opacity, tweeting in 2012: "Why does Obama believe he shouldn't comply with record releases that his predecessors did of their own volition? Hiding something?"

Trump tweet obama
Twitter

In 2012, he called Obama the "least transparent president — ever."

Trump tweet obama
Twitter

The Trump administration said on Friday that it would stop publishing White House visitor logs and that they would be kept secret for five years after Trump leaves office.

Donald trump
REUTERS/Jonathan Ernst/Aly Song/File Photos

Source: Business Insider

5. Experience: Trump also laid into Obama shortly before the 2012 election, saying he was "a disaster at foreign policy. Never had the experience or knowledge."

Trump tweet obama
Twitter

Trump is the only US president with no military or political experience. Some experts have concluded that his unpredictable actions indicate he has no foreign-policy doctrine.

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Mark Wallheiser/Getty Images

Sources: Politico, New York Times

6: Diplomacy: Trump said in an April 2016 campaign speech focused on foreign policy that Obama had "picked fights with our oldest friends."

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Getty Images/Pool

Source: New York Times

In his first calls with foreign leaders, Trump reportedly blasted the prime minister of Australia – a staunch US ally – for his refugee policy and talked to the president of Taiwan, which was the first time a US president directly spoke with Taiwan's leadership in over 30 years.

donald trump phone call malcolm turnbull
Trump speaks on the phone with Malcolm Turnbull, the prime minister of Australia, on January 28.
Associated Press/Alex Brandon

Sources: Business Insider, Washington Post

7. Executive orders: Trump went after Obama for issuing executive orders, calling them "major power grabs of authority."

Trump tweet obama executive order
Twitter

In his two terms, Obama signed 277 executive orders, a total on par with his modern predecessors and the lowest yearly average (35) in 120 years. Trump has signed 23 executive orders in 87 days.

donald trump executive order
Trump signs an executive order for border security and immigration enforcement on January 25.
Associated Press/Pablo Martinez Monsivais

Sources: Business InsiderPew Research Center