(CNBC) -- President Donald Trump vowed Thursday that if his dealings with Russian leader Vladimir Putin don't "work out, I'll be the worst enemy he's ever had."
Trump made the statement during an interview at the White House with CNBC's Joe Kernen that will air in full Friday at 6 a.m. ET on "Squawk Box."
In the same interview, Trump blasted his predecessor, President Barack Obama, for having been a "total patsy" for Russia — while claiming he has been "far tougher on Russia than any president in many, many years."
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"Maybe ever," Trump added.