This resurgence by U.S. stocks could lead to tougher negotiations between Greece and its creditors, Daniel Speckhard, a former U.S. ambassador to Greece and Belarus, said in a CNBC " Squawk Alley " interview.
Analyze the relationship between 'Squawk Alley' and 'CNBC' within the context of the input sentence.
Options: legal form, original broadcaster, chief executive officer, platform