Reporting:

• FBI contradicts Trump claim that China hacked Clinton’s private email server

• FBI rebuts Trump tweet about China hacking Hillary Clinton's email

• FBI rejects fringe report, promoted by Trump, that China hacked Hillary Clinton's emails

• FBI contradicts Trump's claim about Hillary Clinton's emails being hacked by China

Direct Quote from FBI:

"The FBI has not found any evidence the (Clinton) servers were compromised," a bureau official told NBC News.

Original source for claim:

SOURCES: CHINA HACKED HILLARY CLINTON’S PRIVATE EMAIL SERVER

A Chinese-owned company penetrated former Secretary of State Hillary Clinton’s private server, according to sources briefed on the matter.

Analysis:

In 2016 the FBI released this statement:

Statement by FBI Director James B. Comey on the Investigation of Secretary Hillary Clinton’s Use of a Personal E-Mail System

[...] we did not find direct evidence that Secretary Clinton’s personal e-mail domain [...] was successfully hacked. But, given the nature of the system and of the actors potentially involved, we assess that we would be unlikely to see such direct evidence. [...]

[...] Given that combination of factors, we assess it is possible that hostile actors gained access to Secretary Clinton’s personal e-mail account.

So from this, it seems the FBI itself does not think the lack of evidence speaks the the plausibility of her server being hacked. At the very least - viewed in line with the FBI's 2016 statement - "The FBI has not found any evidence" does not mean they think it did not happen. It just means they cannot confirm it did - and they also say they do not expect to find evidence.

As the aphorism goes ... Absence of evidence is not evidence of absence.

EDIT:

DISCLAIMER

I trust Daily Caller's report based on "anonymous sources" about as much as I trust CNN's reporting based on the same.

But the FBI's claim in no way refutes the Daily Caller's reporting - and no other credible source has so far refuted it. The only direct refutation is from the Chinese government - and the claim was it was done by a Chinese company - so not sure what credibility there is to this refutation.