The rally followed a series of racist tweets in which Trump suggested that four minority congressmen "return" to their home countries. Three were born in America and all four are US citizens.
Kaeser suggested that Trump's attacks do not reflect the America he knew.
Kaeser, who began work at Siemens in 1
At the beginning of the year, Kaeser sharply criticized a German legislator and declared that his nationalism was detrimental to the prosperity of the country.
"I'm here to represent the company and be accountable to the shareholders On the other hand, when people turn their heads off … Well, we had that time in Germany," Kaeser told the Financial Times in May 2018.
"No one spoke, then it was too late," he added.
"Once I learned of his death, it was clear I think we could not just go ahead and do business as usual," said Kaeser last October.
– Martin Goillandeau contributed to the coverage.