Congress to Hear Fannie Mae CEO, CFO  WASHINGTON (Reuters) - The chief executive and chief  financial officer of mortgage finance company Fannie Mae  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=FNM.N target=/stocks/quickinfo/fullquote"&gt;FNM.N&lt;/A&gt;, under fire for alleged accounting irregularities, will  appear before a congressional panel next week, a company  spokesman said on Wednesday.