President Donald Trump 's presidency has been uniquely good for businesses, according to Bill Ackman , CEO of Pershing Square Capital Management.

"I think Trump has been the most pro-business president we've ever had," Ackman said Tuesday morning on CNBC's "Squawk Box."

Ackman pointed to infrastructure and tax bills as having positive effects for businesses. He also noted that the Federal Reserve is "accommodative" of interest rate cuts.

Ackman acknowledged that he was "a little bit concerned" by Trump's market-roiling tariff policy first unveiled in April. However, Ackman credited Trump for changing his position after the billionaire investor suggested taking a pause before implementing the policy.

"I trust the president," said Ackman, who has been a public supporter of Trump.

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