London (CNN Business) A top Siemens executive has warned that chaos over Brexit is wrecking the United Kingdom's reputation as a place to do business and turning it into a "laughing stock."

Siemens SIEGY "Enough is enough. We are all running out of patience," Juergen Maier, the CEO ofUK, told lawmakers in an open letter published Monday in Politico

Maier said that continued uncertainty over Brexit has made it difficult to invest in the United Kingdom, where the global engineering giant employs 15,000 people and generates annual sales of roughly £5 billion ($6.6 billion).

The CEO said in the letter that he can "no longer defend" the actions of parliament to his board, "making it hard to win support for finely balanced investment decisions" that affect UK jobs and competitiveness.

The world is watching, and where the UK used to be beacon for stability, we are now becoming a laughing stock." Juergen Maier

UK lawmakers will vote Monday on alternatives to Prime Minister Theresa May's divorce deal, which they have rejected three times. The exit deadline — delayed once already — is less than two weeks away.

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