1. how did Obama know the contents of the Flynn conversation with Russia Ambassador?

simple:
the British Spy Agency GCHQ was spying on Flynn & Trump using the NSA tools, since Aug 2016. https://www.foxnews.com/politics/obama-knew-details-of-wiretapped-flynn-phone-calls-surprising-top-doj-official-new-docs-show

2. The GCHQ Spy Operation on the Trump Team had been requested by Obama in Aug 2016.

much more powerful than FISA.
100's of times more powerful.
.

3. do you remember this Trump tweet?
March 4, 2017:

4. the Director of the British Spy Agency - Robert Hannigan - resigned on Jan 23, 2017 - 3 days after Trump Inauguration.

coincidence?
.

5. Let's see what Judge Napolitano said, in March 2017:

"Obama used the British GCHQ to spy on the Trump Team"
.

6. want to hear directly from Judge Napolitano?

there you go:
March 14, 2017 - 10 days after the Trump tweet:
.

7. and with this, Barack, bye bye!
one way ticket to Greenland Thule AFB - nice weather there,
much better than G I T M O !

8. please RETWEET #1

9. This is the GCHQ/CSO Morwenstow station in Cornwall, England:
shared by the GCHQ and NSA.
the NSA pays the bills.

$20 Million in 2010.

to better spy on Trump and Flynn @GenFlynn
.

10. After that GCHQ bombshell revelation,
Judge Napolitano was FIRED by Fox News.

coincidence?
No.

the British were not happy. so they threatened the CIA,
and the CIA told Fox News to fire Napolitano.

who was the CIA Director in March 2017 ?

11. no, it wasn't the Russians who interfered in the 2016 Election.
it was the British,
and a foreigner usurper put in the oval office by a foreign power.

with the help of John Brennan.
who had been recruited by the same foreign power.
.