I may be one of the few who remember the scandal which plagues the Clinton administration in the 1990s. No, not Monica, but Charlie Trie and John Huang.
Anyone interested can read this collection of Post articles, For those too lazy busy to do the reading, the capsule summary is that the Democrats accepted donations from various individuals, either Chinese or Chinese-Americans, which might have violated or indeed did violate laws on permissible political donations. The Republicans pointed at sleaze, claimed the money originated in China, were intended as bribes for favorable treatment and friendly attitudes by the government, and must be investigated by a special counsel.
If I recall, because I'm too lazy to research, the scandal eventually petered out with. Some cases ended in not guilty findings, some in plea bargains, some were more smoke than fire, some were fuzzy areas in the laws.
I'm now reading Andrew Weissmann's "Where the Law Ends: Inside the Mueller Investigation". I'll comment on the book another time, but what's striking is the degree to which the Trump campaign welcomed Russian aid, specifically the hacks of the DNC and DCC. Granted there's a difference between money and other kinds of aid, but I don't remember Republicans criticizing the campaign for doing so.