Li Ka-shing’s CK Hutchison Holdings Ltd. has hired law firm Paul Hastings LLP to work on the blockbuster sale of its ports business, a major win for an adviser that rarely cracks the top of M&A league tables,

The deal comes after U.S. President Donald Trump repeatedly threatened to take control of the Panama Canal and end what he sees as China’s influence over the waterway critical to global trade.

BlackRock, America’s largest asset manager which handles over $11 trillion in assets, has agreed to purchase two ports on either end of the Panama Canal. BlackRock is buying the ports from Hong Kong-based CK Hutchison in a deal worth about $22.8 billion.