President Donald Trump said high duties imposed by India on the U.S. products are unacceptable and called on New Delhi to remove them, just before he will meet Prime Minister Narendra Modi at the G-20 summit in Japan.

“I look forward to speaking with Prime Minister Modi about the fact that India, for years having put very high Tariffs against the United States, just recently increased the Tariffs even further,” President Trump Trump tweeted Thursday while aboard Air Force One.

“This is unacceptable and the Tariffs must be withdrawn!” he wrote.

President Trump is scheduled to have one-on-one meetings with a handful of world leaders at the sideline of G-20 summit in Osaka, including Japanese Prime Minister Shinzo Abe, German Chancellor Angela Merkel, and India Prime Minister Modi on Friday, June 28.

Trump made his criticism after India slapped higher tariffs on 28 U.S. products from June 15, after the United States scrapped trade privileges under the Generalized System of Preferences (GSP) for New Delhi from June 5, according to Reuters.

Even before winning White House in 2017, President Trump vowed to act against countries that run a large trade surplus with Washington. India is the biggest beneficiary of the GSP scheme that allows duty-free exports of $5.6 billion.

In an effort to reduce tariff disputes with India, Secretary of State Mike Pompeo arrived at New Delhi on Wednesday, promising a renewed focus on negotiating better ties.